AS-Interface Slave IC

AS2701A (ISA3+)

Rev. C, October 2000

Page 11 of 16

For successful programming the programmer hardware must have sink/source capability of at

least 5 mA, and the AS-Interface Slave IC's supply voltage LTGP has to be in the range of

26.65 V ...33.35 V.

The only E

Slave IC (hence over the AS-Interface Bus and by the AS-Interface Master), are locations 0

and 1, which both have been reserved for the AS-Interface Slave unit's address.

The E

E

Address

D7

D6

D5

D4

D3

D2

D1

D0

Initialization Data

0

0

0

0

AS-Interface address

0

1

0

0

0

AS-Interface address

0

2

ID Code

IO Configuration

Custom Specific Data

3

ID Code

IO Configuration

Custom Specific Data

Recommended E

Supplier

Type

Organization

Philips

PCA8581P

128 x 8

ST

ST24C01

128 x 8

Catalyst

CAT24LC02(Z)IP

256 x 8

Xicor

X24LC02PI

256 x 8

Catalyst

CAT24LC04(Z)IP

512 x 8

Xicor

X24(L)C04PI

512 x 8

f) Sensor / actuator supply pin UOUT / Functional and electrical

characteristics

Symbol

Parameter

min

max

Unit

Note

VUOUT

Output Voltage at UOUT

VLTGP –

VDROP min

VLTGP –

VDROPmin

V

IUOUT = 35 mA

VUOUTp

Overswing of the Output

Voltage

1.5

V

CUOUT = 10 µF:

Switching 0-35 mA - 0

Overswing Impulse Width

2.

ms

VDROP

Voltage Drop from LTGP

to UOUT

5.5

6.7

V

IUOUT

Output Current UOUT

0

35

mA

11.0 V < VUOUT < 27.6 V

CUOUT

Load Capacity UOUT

10

470

µF

The interface is intended for the supply voltage to actuators, sensors as well as external

circuits with a power supply of <35mA without overloading the AS-Interface line in the range of

the signal frequency. The AS-Interface slave IC has an internal circuit protector which limits the

current during the charging of the load capacitor and which effects a power down at thermal

overload, e.g. at too high output currents.

In the case of a current break down on the AS-Interface line of less than 1ms, the internally

stored information is retained. The supply voltage of the IC during this time is extracted from

the capacitor Pin UOUT which is disconnected from the AS-Interface line.