AS-Interface Slave IC

AS2702 (SAP4.1)

Rev. C, January 2001

Page 12 of 18

The dc- and timing parameters of strobe pin PSTBn are specified as follows:

6\PERO

3DUDPHWHU

PLQ

PD[

8QLW

1RWH

IOUTLO

Sink current @ output L

10

mA

VOUT = 1V

IOUTHI

Leakage current @ output off

- 10

10

µA

VOUT = 5V

IINLO

Input current @ VIN = 1V

- 5

- 20

µA

1

VSCHLT

Input threshold voltage

1.5

3.5

V

2

VIN

Acceptable input voltage @ out-

put off

- 0.3

40

V

tNOTM

PSTBn L-phase width, not trig-

gering testmode

35

µs

tTM

PSTBn L-phase width, triggering

testmode

50

µs

CPINEXT

Stray capacitance

20

pF

Notes:

1

PSTBn is equipped with an on-chip pull-up current source, which ensures

a sufficiently fast LH-edge upon output switch-off in open-pin condition, to prevent

erroneous testmode triggering.

If PSTBn has an external load connected to it, an additional external pull-up resistor

may be needed to prevent erroneous testmode triggering upon output switch-off

2

No hysteresis implemented

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Pins LED1 and LED2 are both equipped with a low-side open-drain output switch plus a pas-

sive high-side current source with a nom. 10 µA pull-up current capability. They will each have

an LED load connected to UOUT, which will flag the operation status of the slave device, ac-

cording to the following table:

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6ODYH 'HYLFH

2SHUDWLRQ6WDWXV

5HDVRQ

JUHHQ /('

FRQQHFWHG

UHG /(' FRQ

QHFWHG

 KLJKHVW«

 ORZHVW

off

off

Supply voltage off

No supply voltage

on

off

Regular operation

off

on

4

No Data

Communication

Regular, non-zero

slave address coded;

data comm. watchdog

triggered

blinks

on

3

No regular slave

address coded

Slave address = de-

fault zero

blinks

blinks

(alternating with

LED1)

2

Hardware failure in

sensor / acuator

circuitry

Input PFAULT = L

off

blinks

1

External RESET or

Overload at UOUT

pin

DSTBn = L to RESET,

or UOUT switched-off

due to overload

(LED1 and LED2 both also feature an input stage, to simplify component test and shorten test

time of the slave device.)

The dc- and timing parameters of pins LED1 and LED2 are specified as follows: