IST TSic 206 Istruzioni per l'installazione e il funzionamento

Application Note

Temperature Sensor IC

ATTSic_E2.1.4 | App Note | Temperature Sensor IC 1/15

Application Note

Temperature Sensor IC

Content

1. TSic 206/203/201/306/316/303/301 3

2. TSic 506F/503F/516/501F 4

3. TSic 716 5

4. TSic Accuracy Overview1) 5

5. ZACwireTM Digital Output 5

6. Die and Package Specications 11

7. TSic Block Diagram 14

8. Additional Documents 15

ATTSic_E2.1.4 | App Note | Temperature Sensor IC 2/15

Application Note

Temperature Sensor IC

1. TSic 206/203/201/306/316/303/301

The TSic series of temperature sensor ICs are specically

designed as a low-power solution for temperature mea-

surement in building automation, medical/pharma tech-

nologies, industrial and mobile applications. The TSic pro-

vides a simple temperature measurement and achieves

outstanding accuracy combined with long term stability.

The TSic has a high precision bandgap reference with a

PTAT (proportional-to-absolute-temperature) output, a

low-power and high-precision ADC and an on-chip DSP

core with an EEPROM for the precisely calibrated output

signal. The TSic temperature sensor is fully calibrated,

meaning no further calibration effort is required by the

customer.

Extended long wires (> 10 m) will not inuence the accuracy. The TSic is available with digital (ZacWireTM, TSic x06),

analog (0 V to 1V, TSic x01) or ratiometric (10 % to 90 % V+, TSic x03) output signal. The low power consumption of

about 35 µA makes it suitable for many applications.

With an accuracy of ±0.3 K in a temperature range of 80 K (e.g. +10 °C to +90 °C), the TSic sensors are more ac-

curate than a class F0.3 (IEC60751) platinum sensor. The tolerances of the TSic and F 0.3 and F 0.15 platinum sensors

are compared in Figure 1. With a standard calibration, the TSic 30x is more accurate than a F 0.3 platinum sensor in

the range of +10 °C to +110 °C. The range can be shifted up or downwards to reach a high accuracy between e.g.

-30 °C to +50 °C.

Output examples Temperature Range: -50 °C to +150 °C

Temp (°C) Digital Values

(TSic x06)

Analog 0 V to 1 V

(TSic x01)

Analog Ratiometric 10 % to 90 % (V+ = 5.0 V)

(TSic x03)

-50 1) 0x000 0.000 10 % V+ (0.5 V)

-10 0x199 0.200 26 % V+ (1.3 V)

00x200 0.250 30 % V+ (1.5 V)

25 0x2FF 0.375 40 % V+ (2.0 V)

60 0x465 0.550 54 % V+ (2.7 V)

125 0x6FE 0.875 80 % V+ (4.0 V)

150 2) 0x7FF 1.000 90 % V+ (4.5 V)

1) LT = -50 2) HT = 150 as standard value for the temperature calculation

Formulas for the output signal [°C]:

Analog output (0 V to 1 V): T = Sig [V] x (HT - LT) + LT [°C]

Ratiometric output (10 % to 90 %): T =

Sig [V] -0.1

V+ [V]

0.8 x (HT - LT) + LT [°C]

Digital output - 11 bit: T =

Digital signal

2047 x (HT - LT) + LT [°C]

Digital output - 14 bit (TSic 316): T =

Digital signal

16383 x (HT - LT) + LT [°C]

ATTSic_E2.1.4 | App Note | Temperature Sensor IC 3/15

LT: Lower temperature limit [= -50 °C]

HT: Higher temperature limit [= +150 °C]

V+: Supply voltage [V]

Sig[V]: Analog/ratiometric output signal [V]

2. TSic 506F/503F/516/501F

The TSic series of temperature sensor ICs are

specically designed as a low-power solution

for temperature measurement in building auto-

mation, medical / pharma technologies, indust-

rial and mobile applications. The TSic provides a

simple temperature measurement and achieves

outstanding accuracy combined with long term

stability.

The TSic has a high precision bandgap reference

with a PTAT (proportional-to-absolute-tempera-

ture) output, a low-power and high-precision

ADC and an on-chip DSP core with an EEPROM

for the precisely calibrated output signal.

The TSic temperature sensor is fully calibrated, meaning no further calibration effort is required by the customer. With

an accuracy of ±0.1 K in a range of 40 K (e.g. +5 °C to +45 °C), the sensor is more accurate than a class F0.1 (IEC

60751) platinum sensor. Extended long wires (> 10 m) will not inuence the accuracy. The TSic is available with digital

(ZacWireTM, TSic 506F),analog (0 V to 1 V, TSic 501F) or ratiometric (10 % to 90 % V+, TSic 503F) output signal. The

low power consumption of about 35 µA makes it suitable for many applications.

Output Examples Temperature Range: -10 °C to +60 °C

Temp (°C) Digital Values

(TSic x06)

Analog 0 V to 1 V (TSic x01) Analog Ratiometric 10 % to 90 % (V+ = 5.0 V) (TSic x03)

< -10 to -101) 0x000 0.000 10 % V+ (0.5 V)

00x124 0.143 21.4 % V+ (1.07 V)

25 0x3FF 0.500 50 % V+ (2.5 V)

+602 to > +60 0x7FF 1.000 90 % V+ (4.5 V)

1) LT = -10

2) HT = 60 as standard value for the temperature calculation

Formulas for the output signal [°C]:

Analog output (0 V to 1 V): T = Sig [V] x (HT - LT) + LT [°C]

Ratiometric output (10 % to 90 %): T =

Sig [V] -0.1

V+ [V]

0.8 x (HT - LT) + LT [°C]

Digital output - 11 bit: T = Digital signal

2047 x (HT - LT) + LT [°C]

Digital output - 14 bit (TSic 516): T = Digital signal

16383 x (HT - LT) + LT [°C]

LT: Lower temperature limit [= -10 °C]

HT: Higher temperature limit [= +60 °C]

V+: Supply voltage [V]

Sig[V]: Analog/ratiometric output signal [V]

ATTSic_E2.1.4 | App Note | Temperature Sensor IC 4/15

3. TSic 716

The TSic series of temperature sensor ICs are specically designed as a low-power solution for temperature measu-

rement in building automation, medical/pharma technologies, industrial and mobile applications. The TSic provides a

simple temperature measurement and achieves outstanding accuracy combined with long term stability.

The TSic has a high precision bandgap reference with a PTAT (proportional-to-absolute-temperature) output, a low-po-

wer and high-precision ADC and an on-chip DSP core with an EEPROM for the precisely calibrated output signal. The

IST AG TSic sensor is fully tested and calibrated to ensure the guaranteed accuracy.

Output Examples Temperature Range: -10 °C to +60 °C

Temp (°C) Digital

+35 0x2925

+40 0x2DB7

+45 0x3249

Formulas for the output signal [°C]:

Digital output: T = Digital signal

16383

x (HT - LT) + LT [°C]

LT: Lower temperature limit [= -10 °C]

HT: Higher temperature limit [= +60 °C]

V+: Supply voltage [V]

4. TSic Accuracy Overview1)

3223

range 1

range 3

range 2

Product Resolution Range 1 Accuracy 1 Range 2 Accuracy 2 Range 3 Accuracy 3

TSic 20x 0.1 °C +10 °C to +90 °C ±0.5 °C -20 °C to +110 °C ±1 °C -50 °C to +150 °C ±2 °C

TSic 30x 0.1 °C +10 °C to +90 °C ±0.3 °C -20 °C to +110 °C ±0.6 °C -50 °C to +150 °C ±1.2 °C

TSic 50x 0.034 °C +5 °C to +45 °C ±0.1 °C - - -10 °C to +60 °C ±0.2 °C

TSic 716 0.004 °C +25 °C to +45 °C ±0.07 °C - - -10 °C to +60 °C ±0.2 °C

1) Range 1 can be shifted to a customer specic temperature

5. ZACwireTM Digital Output

5.1 TSic ZACwireTM Communication Protocol

ZACwireTM is a single wire bi-directional communication protocol. The bit encoding is similar to Manchester in that

clocking information is embedded into the signal (falling edges of the signal happen at regular periods). This allows

the protocol to be largely insensitive to baud rate differences between the two ICs communicating. In end-user appli-

cations, the TSic will be transmitting temperature information, and another IC in the system (most likely a µController)

will be reading the temperature data over the ZACwireTM.

ATTSic_E2.1.4 | App Note | Temperature Sensor IC 5/15

5.2 Temperature Transmission Packet from a TSic

The TSic transmits 1-byte packets. These packets consist of a start bit, 8 data bits, and a parity bit. The nominal baud

rate is 8 kHz (125 µsec bit window). The signal is normally high. When a transmission occurs, the start bit occurs rst

followed by the data bits (MSB rst, LSB last). The packet ends with an even parity bit.

Start Bit

MSB (7)

LSB (0)

Parity (Even)

Figure 1.1 – ZACwireTM Transmission Packet

The TSic provides temperature data with 11-bit or 14-bit resolution, and obviously these 11 bits or 14-bit of infor-

mation cannot be conveyed in a single packet. A complete temperature transmission from the TSic consists of two

packets. The rst packet contains the most signicant 3 bits or 6 bits of temperature information, and the second

packet contains the least signicant 8 bits of temperature information. There is a single bit window of high signal

(stop bit) between the end of the rst transmission and the start of the second transmission.

Start

( T [13] )

( T [12] )

( T [11] )

T [10]

T [9]

T [8]

Parity

Start

T [7]

T [6]

T [5]

T [4]

T [3]

T [2]

T [1]

T [0]

Parity

For 14-bit res.

Figure 1.2 – Full ZACwireTM Temperature Transmission from TSic

5.3 Bit Encoding

The bit format is duty cycle encoded:

Start bit => 50 % duty cycle used to set up strobe time

Logic 1 => 75 % duty cycle

Logic 0 => 25 % duty cycle

Perhaps the best way to show the bit encoding is with an oscilloscope trace of a ZACwireTM transmission. The follo-

wing shows a single packet of 96 Hex being transmitted. Because 96 Hex is already even parity, the parity bit is zero.

ATTSic_E2.1.4 | App Note | Temperature Sensor IC 6/15

strobe

Figure 1.3 – ZACwireTM Transmission

5.4 How to Read a Packet

When the falling edge of the start bit occurs, measure the time until the rising edge of the start bit. This time (Tstrobe)

is the strobe time. When the next falling edge occurs, wait for a time period equal to Tstrobe, and then sample the

ZACwireTM signal. The data present on the signal at this time is the bit being transmitted. Because every bit starts

with a falling edge, the sampling window is reset with every bit transmission. This means errors will not accrue for

bits downstream from the start bit, as it would with a protocol such as RS232. It is recommended, however, that the

sampling rate of the ZACwireTM signal when acquiring the start bit be at least 16x the nominal baud rate. Because the

nominal baud rate is 8 kHz, a 128 kHz sampling rate is recommended when acquiring Tstrobe.

5.5 How to Read a Packet using a µController

It is best to connect the ZACwireTM signal to a pin of the µController that is capable of causing an interrupt on a fal-

ling edge. When the falling edge of the start bit occurs, it causes the µController to branch to its ISR. The ISR enters

a counting loop incrementing a memory location (Tstrobe) until it sees a rise on the ZACwireTM signal. When Tstrobe has

been acquired, the ISR can simply wait for the next 9 falling edges (8-data, 1-parity). After each falling edge, it waits

for Tstrobe to expire and then sample the next bit.

The ZACwireTM line is driven by a strong CMOS push/pull driver. The parity bit is intended for use when the ZACwireTM

is driving long (> 2 m) interconnects to the µController in a noisy environment. For systems in which the “noise en-

vironment is more friendly”, the user can choose to have the µController ignore the parity bit. In the appendix of this

document is sample code for reading a TSic ZACwireTM transmission using a PIC16F627 µController.

5.6 How Often Does the TSic Transmit?

If the TSic is being read via an ISR, how often is it interrupting the µController with data? The update rate of the TSic

can be programmed to one of 4 different settings: 250 Hz, 10 Hz, 1 Hz, and 0.1 Hz. This is done during calibration

of the sensor on IST AG side. The standard update rate is 10 Hz (TSic 206, TSic 306, TSic 506) or 1 Hz (TSic 716). For

other update rates please contact IST AG. Servicing a temperature-read ISR requires about 2.7 ms. If the update rate

of the TSic is programmed to 250 Hz, then the µController spends about 66 % of its time reading the temperature

transmissions. If, however, the update rate is programmed to something more reasonable like 1 Hz, then the μCont-

roller spends about 0.27 % of its time reading the temperature transmissions.

ATTSic_E2.1.4 | App Note | Temperature Sensor IC 7/15

5.7 Solutions if Real Time System Cannot Tolerate the TSic Interrupting the µController

Some real time systems cannot tolerate the TSic interrupting the µController. The µController must initiate the tempe-

rature read. This can be accomplished by using another pin of the µController to supply VDD to the TSic. The TSic will

transmit its rst temperature reading approximately 65-85 ms 1) (@RT) after power up. When the µController wants

to read the temperature, it rst powers the TSic using one of its port pins. It will receive a temperature transmission

approximately 65 ms to 85 ms later. If during that 85 ms, a higher priority interrupt occurs, the µController can simply

power down the TSic to ensure it will not cause an interrupt or be in the middle of a transmission when the high

priority ISR nishes. This method of powering the TSic has the additional benet of acting like a power down mode

and reducing the quiescent current from a nominal 45 µA to zero. The TSic is a mixed signal IC and provides best

performance with a clean VDD supply. Powering through a µController pin does subject it to the digital noise present

on the µController’s power supply. Therefore it is best to use a simple RC lter when powering the TSic with a µCon-

troller port pin. See the diagram below

1) This value is depending on the temperature. In lower temperatures this value can be lower too

5.8 Appendix A: An Example of PIC1 Assembly Code for Reading the ZACwireTM

In the following code example, it is assumed that the ZACwireTM pin is connected to the interrupt pin (PORTB, 0) of

the PIC and that the interrupt is congured for falling edge interruption.

This code should work for a PIC running between 2 MHz to12 MHz.

TEMP_HIGH EQU 0X24 ;; MEMORY LOCATION RESERVED FOR TEMP HIGH BYTE

TEMP_LOW EQU 0X25 ;; MEMORY LOCATION RESERVED FOR TEMP LOW BYTE

;; THIS BYTE MUST BE CONSECUTIVE FROM TEMP_HIGH

LAST_LOC EQU 0X26 ;; THIS BYTE MUST BE CONSECUTIVE FROM TEMP_LOW

TSTROBE EQU 0X26 ;; LOCATION TO STORE START BIT STROBE TIME

ORG 0X004 ;; ISR LOCATION

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

CODE TO SAVE ANY NEEDED STATE AND TO DETERMINE THE SOURCE OF THE ISR GOES HERE. ONCE YOU HAVE

DETERMINED THE SOURCE IF THE INTERRUPT WAS A ZAC WIRE TRANSMISSION THEN YOU BRANCH TO ZAC_TX

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

ZAC_TX: MOVLW TEMP_HIGH ;; MOVE ADDRESS OF TEMP_HIGH (0X24) TO W REG

MOVWF FSR ;; FSR = INDIRECT POINTER, NOW POINTING TO TEMP_HIGH

GET_TLOW: MOVLW 0X02 ;; START TSTROBE COUNTER AT 02 TO ACCOUNT FOR

MOVWF TSTROBE ;; OVERHEAD IN GETTING TO THIS POINT OF ISR

CLRF INDF ;; CLEAR THE MEMORY LOCATION POINTED TO BY FS

ATTSic_E2.1.4 | App Note | Temperature Sensor IC 8/15

STRB: INCF TSTROBE,1 ;; INCREMENT TSTROBE

BTFSC STATUS,Z ;; IF TSTROBE OVERFLOWED TO ZERO THEN

GOTO RTI ;; SOMETHING WRONG AND RETURN FROM INTERRUPT

BTFSS PORTB,0 ;; LOOK FOR RISE ON ZAC WIRE

GOTO STRB ;; IF RISE HAS NOT YET HAPPENED INCREMENT TSTROBE

CLRF BIT_CNT ;; MEMORY LOCATION USED AS BIT COUNTER

BIT_LOOP: CLRF STRB_CNT ;; MEMORY LOCATION USED AS STROBE COUNTER

CLRF TIME_OUT ;; MEMORY LOCATION USED FOR EDGE TIME OUT

WAIT_FALL: BTFSS PORTB,0 ;; WAIT FOR FALL OF ZAC WIRE

GOTO PAUSE_STRB ;; NEXT FALLING EDGE OCCURRED

INCFSZ TIME_OUT,1 ;; CHECK IF EDGE TIME OUT COUNTER OVERFLOWED

GOTO WAIT_FALL

GOTO RTI ;; EDGE TIME OUT OCCURRED

PAUSE_STRB: INCF STRB_CNT,1 ;; INCREMENT THE STROBE COUNTER

MOVF TSTROBE,0 ;; MOVE TSTROBE TO W REG

SUBWF STRB_CNT,0 ;; COMPARE STRB_CNT TO TSTROBE

BTFSS STATUS,Z ;; IF EQUAL THEN IT IS TIME TO STROBE

GOTO PAUSE_STRB ;; ZAC WIRE FOR DATA, OTHERWISE KEEP COUNTING

;; LENGTH OF THIS LOOP IS 6-STATES. THIS HAS TO

;; MATCH THE LENGTH OF THE LOOP THAT ACQUIRED TSTROBE

BCF STATUS,C ;; CLEAR THE CARRY

BTFSC PORTB,0 ;; SAMPLE THE ZAC WIRE INPUT

BSF STATUS,C ;; IF ZAC WIRE WAS HIGH THEN SET THE CARRY

RLF INDF,1 ;; ROTATE CARRY=ZAC WIRE INTO LSB OF REGISTER

;; THAT FSR CURRENTLY POINTS TO

CLRF TIME_OUT ;; CLEAR THE EDGE TIMEOUT COUN

WAIT_RISE: BTFSC PORTB,0 ;; IF RISE HAS OCCURRED THEN WE ARE DONE

GOTO NEXT_BIT

INCFSZ TIME_OUT,1 ;; INCREMENT THE EDGE TIME OUT COUNTER

GOTO WAIT_RISE

GOTO RTI ;; EDGE TIME OUT OCCURRED.

NEXT_BIT: INCF BIT_CNT,1 ;; INCREMENT BIT COUNTER

MOVLW 0X08 ;; THERE ARE 8-BITS OF DATA

SUBWF BIT_CNT,0 ;; TEST IF BIT COUNTER AT LIMIT

BTFSS STATUS,Z ;; IF NOT ZERO THEN GET NEXT BIT

GOTO BIT_LOOP

CLRF TIME_OUT ;; CLEAR THE EDGE TIME OUT COUNTER

WAIT_PF: BTFSS PORTB,0 ;; WAIT FOR FALL OF PARITY

GOTO P_RISE

INCFSZ TIME_OUT,1 ;; INCREMENT TIME_OUT COUNTER

GOTO WAIT_PF

GOTO RTI ;; EDGE TIMEOUT OCCURRED

P_RISE: CLRF TIME_OUT ;; CLEAR THE EDGE TIME OUT COUNTER

WAIT_PR: BTFSC PORTB,0 ;; WAIT FOR RISE OF PARITY

GOTO NEXT_BYTE

INCFSZ TIME_OUT,1 ;; INCREMENT EDGE TIME OUT COUNTER

GOTO WAIT_PR

GOTO RTI ;; EDGE TIME OUT OCCURRED

ATTSic_E2.1.4 | App Note | Temperature Sensor IC 9/15

NEXT_BYTE: INCF FSR,1 ;; INCREMENT THE INDF POINTER

MOVLW LAST_LOC

SUBWF FSR,0 ;; COMPARE FSR TO LAST_LOC

BTFSS STATUS,Z ;; IF EQUAL THEN DONE

GOTO WAIT_TLOW

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; IF HERE YOU ARE DONE READING THE ZAC WIRE AND HAVE THE DATA ;;

;; IN TEMP_HIGH & TEMP_LOW ;;

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

WAIT_TLOW: CLRF TIME_OUT

WAIT_TLF: BTFSS PORTB,0 ; WAIT FOR FALL OF PORTB,0 INDICATING

GOTO GET_TLOW ; START OF TEMP LOW BYTE

INCFSZ TIME_OUT

GOTO WAIT_TLF

GOTO RTI ; EDGE TIMEOUT OCCURRED

RTI: ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

;; RESTORE ANY STATE SAVED OFF AT BEGINNING OF ISR ;;

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

BCF INTCON,INTF ;; CLEAR INTERRUPT FLAG

BSF INTCON,INTE ;; ENSURE INTERRUPT RE-ENABLED

RETFIE ;; RETURN FROM INTERRUPT

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ATTSic_E2.1.4 | App Note | Temperature Sensor IC 10/15

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