Philips PTN3501 Manuale utente

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PTN3501

Maintenance and control device

Product specification

Supersedes data of 2000 Nov 22 2001 Jan 17

INTEGRATED CIRCUITS

Philips Semiconductors Product specification

PTN3501Maintenance and control device

2001 Jan 17 853-2227 25436

FEATURES

•I2C to parallel port expander

•Internal 256x8 E2PROM

•Self timed write cycle (5 ms typ.)

•16 byte page write operation

•Controlled pull-up on address lines

•Low voltage VCC range of +2.5 V to +3.6 V

•5 V – tolerant I/Os

•Low standby current (< 60 µA )

•Power on Reset

•Supports Live Insertion

•Compatible with SMBus specification version 1.1

•High E2PROM endurance and data retention

•Available in TSSOP20 package

DESCRIPTION

The PTN3501 is a general purpose maintenance and control device.

It features an on-board E2PROM that can be used to store error

codes or board manufacturing data for read–back by application

software for diagnostic purposes.

The eight quasi bidirectional data pins can be independently

assigned as inputs or outputs to monitor board level status or

activate indicator devices such as LEDs.

The PTN3501 has six address pins allowing up to 64 devices to

share the common two wire I2C software protocol serial data bus.

The PTN3501 supports live insertion to facilitate usage in removable

cards on backplane systems.

The PTN3501 is an alternative to the functionally similar PTN3500

for systems where a high number of devices are required to share

the same I2C-bus without need for an additional I2C-bus I/O

expander.

PIN CONFIGURATION

SDA

SCL

VDD

SW00657

PTN3501

813 P4

A5 A3

VSS

INT

Figure 1.

PIN DESCRIPTION

PIN NUMBER SYMBOL NAME AND FUNCTION

1,2,3,9,11,12 A0:5 Address Lines

4,5,6,7 P0:3 Quasi–bidirectional I/O pins

10 VSS Ground

13,14,15,16 P4:7 Quasi–bidirectional I/O pins

17 WC Write Control Pin. Should be

tied LOW.

8 INT Interrupt Pin

18 SCL I2C Serial Clock

19 SDA I2C Serial Data

20 VDD Supply Voltage

ORDERING INFORMATION

Type n mber

Package

Type

mber

Name Description Version

PTN3501DH TSSOP20 Plastic thin shrink small-outline package; 20 leads; body width 4.4 mm SOT360-1

FUNCTIONAL DIAGRAM

I2C

CONTROL 8-BIT

I/O PORT P7:0

A5:0

SDA

SCL

E2PROM

256 ×8

INT

SW00647

Figure 2.

Philips Semiconductors Product specification

PTN3501Maintenance and control device

2001 Jan 17 3

CHARACTERISTICS OF THE I2C-BUS

The I2C-bus is for 2-way, 2-line communication between different ICs

or modules. The two lines are a serial data line (SDA) and a serial

clock line (SCL). Both lines must be connected to a positive supply

via a pull-up resistor when connected to the output stages of a device.

Data transfer may be initiated only when the bus is not busy.

Bit transfer

One data bit is transferred during each clock phase. The data on the

SDA line must remain stable during the HIGH period of the clock

pulse as changes in the data line at this time will be interpreted as

control signals (See Figure 3).

Start and stop conditions

Both data and clock lines remain HIGH when the bus is not busy. A

HIGH-to-LOW transition of the data line, while the clock is HIGH is

defined as the start condition (S). A LOW-to-HIGH transition of the

data line while the clock is HIGH is defined as the stop condition (P)

(see Figure 4).

System configuration

A device generating a message is a “transmitter”, a device receiving

is the “receiver”. The device that controls the message is the

“master” and the devices which are controlled by the master are the

“slaves” (see Figure 5).

SDA

SCL

SW00542

DATA LINE

STABLE;

DATA VALID

CHANGE

OF DATA

ALLOWED

Figure 3. Bit transfer

SDA

SCL P

SDA

SCL

SW00543

START CONDITION STOP CONDITION

Figure 4. Definition of start and stop conditions

SDA

SCL

SW00544

MASTER

TRANSMITTER/

RECEIVER SLAVE

TRANSMITTER/

RECEIVER MASTER

TRANSMITTER MASTER

TRANSMITTER/

RECEIVER

Figure 5. System configuration

Philips Semiconductors Product specification

PTN3501Maintenance and control device

2001 Jan 17 4

Acknowledge (see Figure 6)

The number of data bytes transferred between the start and the stop

conditions from transmitter to receiver is not limited. Each byte of

eight bits is followed by one acknowledge bit. The acknowledge bit

is a HIGH level put on the bus by the transmitter whereas the

master generates an extra acknowledge related clock pulse.

A slave receiver which is addressed must generate an acknowledge

after the reception of each byte. Also a master must generate an

acknowledge after the reception of each byte that has been clocked

out of the slave transmitter. The device that acknowledges has to

pull down the SDA line during the acknowledge clock pulse, so that

the SDA line is stable LOW during the HIGH period of the

acknowledge related clock pulse, set–up and hold times must be

taken into account.

A master receiver must signal an end of data to the transmitter by

not generating an acknowledge on the last byte that has been

clocked out of the slave. In this event the transmitter must leave the

data line HIGH to enable the master to generate a stop condition.

9821

SW00545

DATA OUTPUT

BY TRANSMITTER

DATA OUTPUT

BY RECEIVER

SCL FROM

MASTER

ACKNOWLEDGE

NOT ACKNOWLEDGE

CLOCK PULSE FOR

ACKNOWLEDGEMENT

START

CONDITION

Figure 6. Acknowledgment on the I2C-bus

FUNCTIONAL DESCRIPTION

SW00788

WRITE PULSE

DATA FROM

SHIFT REGISTER

POWER-ON

RESET

READ PULSE

DATA TO

SHIFT REGISTER

VDD

P0 TO P7

VSS

100 µA

CIS

TO INTERRUPT LOGIC

Figure 7. Simplified schematic diagram of each I/O

Philips Semiconductors Product specification

PTN3501Maintenance and control device

2001 Jan 17 5

Addressing

For addressing, see Figure 8.

S 0 A5 A4 A3 A2 A1 A0 0 A A5 0 AS 1 A4 A3 A2 A1 A0

a. b.

(a) I/O EXPANDER

(b) MEMORY

SW00648

SLAVE ADDRESSSLAVE ADDRESS

Figure 8. PTN3501 slave addresses

Asynchronous Start

Following any Start condition on the bus, a minimum of 9 SCL clock cycles must be completed before a Stop condition can be issued. The

device does not support a Stop or a repeated Start condition during this time period.

I/O OPERATIONS (see also Figure 7)

Each of the PTN3501’s eight I/Os can be independently used as an input or output. Input I/O data is transferred from the port to the

microcontroller by the READ mode (See Figure 10). Output data is transmitted to the port by the I/O WRITE mode (see Figure 9).

S 0 A5 A4 A3 A2 A1 A0 0 A DATA 1 ADATA 2 ASDA

SCL

tpv

12345678

tpv

DATA 2 VALIDDATA 1 VALID

SW00649

ACKNOWLEDGE

FROM SLAVE

R/WSTART CONDITION ACKNOWLEDGE

FROM SLAVE ACKNOWLEDGE

FROM SLAVE

SLAVE ADDRESS (I/O EXPANDER) DATA TO PORT DATA TO PORT

WRITE TO

PORT

DATA OUT

FROM PORT

Figure 9. I/O WRITE mode (output)

S 0 A5 A4 A3 A2 A1 A0 1 A DATA 1 ADATA 4 1SDA

tph tps

DATA 4

DATA 2 DATA 3

SW00650

SLAVE ADDRESS (I/O EXPANDER) DATA FROM PORT DATA FROM PORT

READ FROM

PORT

DATA INTO

PORT

START CONDITION ACKNOWLEDGE

FROM SLAVE

R/W ACKNOWLEDGE

FROM MASTER STOP

CONDITION

DATA 1

INT

tiv tir

Figure 10. I/O READ mode (input)

Philips Semiconductors Product specification

PTN3501Maintenance and control device

2001 Jan 17 6

Interrupt (see Figs 11 and 12)

The PTN3501 provides an open drain output (INT) which can be fed

to a corresponding input of the microcontroller. This gives these

chips a type of master function which can initiate an action

elsewhere in the system.

An interrupt is generated by any rising or falling edge of the port

inputs in the input mode. After time tiv the signal INT is valid.

Resetting and reactivating the interrupt circuit is achieved when data

on the port is changed to the original setting or data is read from or

written to the port which has generated the interrupt.

Resetting occurs as follows:

•In the READ mode at the acknowledge bit after the rising edge of

the SCL signal

•In the WRITE mode at the acknowledge bit after the

HIGH–to–LOW transition of the SCL signal

•Returning of the port data to its original setting. A second port

state change will require an SCL rising clock edge to be captured

as an INT event.

•Interrupts which occur during the acknowledge clock pulse may

be lost (or very short) due to the resetting of the interrupt during

this pulse.

Each change of the I/Os after resetting will be detected and, after

the next rising clock edge, will be transmitted as INT. Reading from

or writing to another device does not affect the interrupt circuit.

SW00790

PTN3501

(1)

INT

PTN3501

(2)

INT

PTN3501

(16)

INT

MICROCONTROLLER

INT

VDD

Figure 11. Application of multiple PTN3501s with interrupt

S 0 A5 A4 A3 A2 A1 A0 1 A 1 1SDA

SCL 12345678

tir

SW00791

ACKNOWLEDGE

FROM SLAVE

R/WSTART CONDITION STOP CONDITION

SLAVE ADDRESS (I/O EXPANDER) DATA FROM PORT

DATA

INTO P5

INT

tiv

Figure 12. Interrupt generated by a change of input to I/O P5

Philips Semiconductors Product specification

PTN3501Maintenance and control device

2001 Jan 17 7

Quasi-bidirectional I/Os (see Figure 13)

A quasi-bidirectional I/O can be used as an input or output without the use of a control signal for data direction. At power-on the I/Os are HIGH.

In this mode, only a current source to VDD is active. An additional strong pull-up to VDD allows fast rising edges into heavily loaded outputs.

These devices turn on when an output is written HIGH, and are switched off by the negative edge of SCL. The I/Os should be HIGH before

being used as inputs.

S 0 A2 A1 A0 0 A A ASDA

SCL 12345678

SW00789

ACKNOWLEDGE

FROM SLAVE

R/WSTART CONDITION ACKNOWLEDGE

FROM SLAVE

SLAVE ADDRESS (PTN3501) DATA TO PORT DATA TO PORT

OUTPUT

VOLTAGE

PULL-UP

OUTPUT

CURRENT IOHt IOH

A5A4A3

Figure 13. Transient pull-up current IOHt while P3 changes from LOW-to-HIGH and back to LOW

SYMBOL PARAMETER MIN TYP MAX UNIT

tpv Output data valid; CL≤100 pF – – 4 µs

tps Input data setup time; CL≤100 pF 0 – – µs

tph Input data hold time; CL≤100 pF 4 – – µs

tiv Interrupt input data valid time;

CL≤100 pF – – 4 µs

tir Interrupt reset time; CL≤100 pF – – 4 µs

Philips Semiconductors Product specification

PTN3501Maintenance and control device

2001 Jan 17 8

MEMORY OPERATIONS

Write operations

Write operations require an additional address field to indicate the

memory address location to be written. The address field is eight

bits long providing access to any one of the 256 words of memory.

There are two types of write operations, byte write and page write.

Byte Write (see Figure 14)

To perform a byte write the start condition is followed by the memory

slave address and the R/W bit set to 0. The PTN3501 will respond

with an acknowledge and then consider the next eight bits sent as

the word address and the eight bits after the word address as the

data. The PTN3501 will issue an acknowledge after the receipt of

both the word address and the data. To terminate the data transfer

the master issues the stop condition, initiating the internal write cycle

to the non–volatile memory. Only write and read operations to the

quasi–bidirectional I/Os are allowed during the internal write cycle.

Page Write (see Figure 15)

A page write is initiated in the same way as the byte write, if after

sending the first word of data, the stop condition is not received the

PTN3501 considers subsequent words as data. After each data

word the PTN3501 responds with an acknowledge and the four least

significant bits of the memory address field are incremented. Should

the master not send a stop condition after 16 data words the

address counter will return to its initial value and overwrite the data

previously written. After the receipt of the stop condition the inputs

will behave as with the byte write during the internal write cycle.

SW00651

SDA

SLAVE

ADDRESS

(MEMORY) WORD

ADDRESS DATA

S 1 A5 A4 A3 A2 A1 A0 A A

R/W

START CONDITION STOP

CONDITION

ACKNOWLEDGE

FROM SLAVE ACKNOWLEDGE

FROM SLAVE

ACKNOWLEDGE

FROM SLAVE

Figure 14. Byte write

SDA

SW00652

SLAVE ADDRESS

(MEMORY) WORD ADDRESS DATA TO MEMORY

1 A5A4A3A2A1A0 AA

START

CONDITION R/W ACKNOWLEDGE

FROM SLAVE ACKNOWLEDGE

FROM SLAVE

DATA n A

ACKNOWLEDGE

FROM SLAVE

DATA +3n

DATA TO MEMORY

STOP

CONDITION

Figure 15. Page Write

Philips Semiconductors Product specification

PTN3501Maintenance and control device

2001 Jan 17 9

Read operations

PTN3501 read operations are initiated in an identical manner to

write operations with the exception that the memory slave address’

R/W bit is set to a one. There are three types of read operations;

current address, random and sequential.

Current Address Read (see Figure 16)

The PTN3501 contains an internal address counter that increments

after each read or write access, as a result if the last word accessed

was at address n then the address counter contains the address

n+1.

When the PTN3501 receives its memory slave address with the

R/W bit set to one it issues an acknowledge and uses the next eight

clocks to transmit the data contained at the address stored in the

address counter. The master ceases the transmission by issuing the

stop condition after the eighth bit. There is no ninth clock cycle for

the acknowledge.

Random Read (see Figure 17)

The PTN3501’s random read mode allows the address to be read

from to be specified by the master. This is done by performing a

dummy write to set the address counter to the location to be read.

The master must perform a byte write to the address location to be

read, but instead of transmitting the data after receiving the

acknowledge from the PTN3501 the master reissues the start

condition and memory slave address with the R/W bit set to one.

The PTN3501 will then transmit an acknowledge and use the next

eight clock cycles to transmit the data contained in the addressed

location. The master ceases the transmission by issuing the stop

condition after the eighth bit, omitting the ninth clock cycle

acknowledge.

Sequential Read (see Figure 18)

The PTN3501 sequential read is an extension of either the current

address read or random read. If the master doesn’t issue a stop

condition after it has received the eighth data bit, but instead issues

an acknowledge, the PTN3501 will increment the address counter

and use the next eight cycles to transmit the data from that location.

The master can continue this process to read the contents of the

entire memory. Upon reaching address 255 the counter will return to

address 0 and continue transmitting data until a stop condition is

received. The master ceases the transmission by issuing the stop

condition after the eighth bit, omitting the ninth clock cycle

acknowledge.

SW00653

SLAVE ADDRESS

(MEMORY) DATA FROM MEMORY

SDA

START

CONDITION

1A5A4A3A2A1A0 1 A

R/W ACKNOWLEDGE

FROM SLAVE

STOP

CONDITION

Figure 16. Current Address Read

SDA

SW00654

SLAVE ADDRESS

(MEMORY) WORD

ADDRESS

1 A5A4A3A2A1A0 AA

START

CONDITION R/W

ACKNOWLEDGE

FROM SLAVE

ACKNOWLEDGE

FROM SLAVE

ACKNOWLEDGE

FROM SLAVE

DATA FROM MEMORY

STOP

CONDITION

START

CONDITION

1A5A4A3A2A1A0 1

R/W

SLAVE ADDRESS

(MEMORY)

Figure 17. Random Read

SDA

SW00655

SLAVE ADDRESS

(MEMORY) DATA

FROM MEMORY DATA

FROM MEMORY

1 A5A4A3A2A1A0 AA

START

CONDITION R/W ACKNOWLEDGE

FROM SLAVE ACKNOWLEDGE

FROM MASTER

DATA n A

ACKNOWLEDGE

FROM MASTER

DATA N+X

STOP

CONDITION

DATA n+1

DATA

FROM MEMORY

Figure 18. Sequential Read

Philips Semiconductors Product specification

PTN3501Maintenance and control device

2001 Jan 17 10

ABSOLUTE MAXIMUM RATINGS

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied.

SYMBOL PARAMETER MIN MAX UNIT

VCC Supply Voltage –0.5 4.0 V

VIInput Voltage VSS – 0.5 5.5 V

IIDC Input Current –20 20 mA

IODC Output Current –25 25 mA

IDD Supply Current –100 100 mA

ISS Supply Current –100 100 mA

Ptot Total Power Dissipation – 400 mW

POTotal Power Dissipation per Output – 100 mW

TSTG Storage Temperature –65 +150 _C

TAMB Operating Temperature –40 +85 _C

VESD Electrostatic Discharge:

Human Body Model, 1.5 kΩ, 100 pF – >2000 V

Machine Model, 0 Ω, 200 pF – >200 V

DC ELECTRICAL CHARACTERISTICS

Tamb = –40_C to +85_C unless otherwise specified; VCC = 3.3 V

SYMBOL PARAMETER MIN TYP MAX UNIT

Supply

VDD Supply Voltage 2.5 3.3 3.6 V

IDDQ Standby Current; A0thru A5, WC = HIGH – 60 µA

IDD1 Supply Current Read – – 1 mA

IDD2 Supply Current Write – – 2 mA

VPOR Power on Reset Voltage – – 2.4 V

Input SCL; input, output SDA

VIL Input LOW voltage –0.5 –0.3 VDD V

VIH Input HIGH voltage 0.7 VDD – 5.5 V

IOL Output LOW current @ VOL = 0.4 V 3 – – mA

ILInput leakage current @ VI= VDD or VSS –1 – 1 µA

CIInput capacitance @ VI= VSS – – 7 pF

I/O Expander Port

VIL Input LOW voltage –0.5 –0.3 VDD V

VIH Input HIGH voltage 0.7 VDD – 5.5 V

IIHL(max) Input current through protection diodes –400 – 400 µA

IOL Output LOW current @ VOL = 1 V 10 25 – mA

IOH Output HIGH current @ VOH = Vss 30 100 300 µA

IOHt Transient pull–up current – 2 – mA

CIInput Capacitance – – 10 pF

COOutput Capacitance – – 10 pF

Address Inputs A0thru A5, WC input

VIL Input LOW voltage –0.5 –0.3 VDD V

VIH Input HIGH voltage 0.7 VDD – 5.5 V

ILInput leakage current @ VI= VDD –1 – 1 µA

Input leakage (pull-up) current @ VI= VSS 10 25 100 µA

Interrupt output INT

IOL Low level output current; VOL = 0.4 V 1.6 – – mA

ILLeakage current @ VI= VDD or VSS –1 – +1 µA

Indice

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