AS-Interface Slave IC

AS2702 (SAP4.1)

Rev. C, January 2001

Page 6 of 18

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Positive supply pin connected to positive AS-interface bus line and clamped relative to neg.

supply pin / ground LTGN as described under Recommended Operating Conditions.

VLTGP and ILTG specified under Recommended Operating Conditions as well.

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PLQ

PD[

8QLW

1RWH

VSIG

VPP of sin2-data-pulses

on top of dc supply voltage

38

V

Z

Input impedance

between 50 kHz and 300 kHz

40

pF

CCDC = 100 nF

1

18

kOhm

1

50

mH

1

Note:

1

Input equivalent circuit is parallel arrangement of C, R and L

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An external buffer capacitor with a recommended value of 100 nF should be connected to this

pin to ensure a sufficiently high input impedance Z at power supply pin LTGP.

Voltage at this pin can be as high as VLTGP.

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The supply output voltage at UOUT is directly derived from VLTGP and regulated to a level

with an offset of about - 6V relative to VLTGP.

UOUT provides bias to the sensors and actuators circuitry connected to the slave device as

well as to the LEDs connected to outputs LED1 and LED2.

UOUT is equipped with a thermal overload protection, which foresees that VUOUT is switched

off as soon as the slave device’s substrate temperature TJ passes a threshold value in the

range of (155 -+ 20)°C.

After TJ has come down and has passed a temperature threshold about (15 -+ 5)°C lower

than (155 -+ 20)°C and after a consecutive minimum delay of 1 s has elapsed, VUOUT is

switched on again.

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3DUDPHWHU

PLQ

PD[

8QLW

1RWH

VUOUT

Power supply output voltage

VLTGP -

6.3V

VLTGP -

5.3V

V

IUOUT

Load current

50

mA

1

VCOMOFF

UOUT voltage level

9.5

10.5

V

below which data transmission

is inhibited

CUOUT

Buffer capacitor

10

µF

2

Notes:

1

In case IUOUT > 40 mA and presence of sin2-data pulses on LTGP