Philips Semiconductors Product specification
PTN3501Maintenance and control device
2
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

1
2
3
4
5
6
7
20
19
18
17
16
15
14
A0
A1
A2
P0
P1
P2
P3
SDA
SCL
P7
P6
P5
WC
VDD
SW00657
PTN3501
813 P4
9
10
12
11
A5 A3
A4
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

Typen mber
Package
Type
n
u
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
WC
INT
SW00647
Figure 2.