3

4575D–BCD–09/05

ATA6830

Table 2-1.

Pin Description

Pin

Symbol

Function

1

VBAT1A

Battery voltage

2

NC

Not connected

3

SM1A

Connection for stepping motor winding A

4

SRA

Sense resistor A connection

5

SM2A

Connection for stepping motor winding A

6

NC

Not connected

7

VBAT2A

Battery voltage

8

NC

Not connected

9

SCI1

Test pin, please connect to ground for EMC reasons

10

SCO1

Test pin, please connect to ground for EMC reasons

11

SCI2

Test pin, please connect to ground for EMC reasons

12

SCO2

Test pin, please connect to ground for EMC reasons

13

TA

Test pin, please connect to ground for EMC reasons

14

TTEMP

Test pin, please connect to ground for EMC reasons

15

VBAT2B

Battery voltage

16

NC

Not connected

17

SM2B

Connection for stepping motor winding B

18

SRB

Sense resistor B connection

19

SM1B

Connection for stepping motor winding B

20

NC

Not connected

21

VBAT1B

Battery voltage

22

BUS

Receives the control instructions via the single wire bus from the controller

23

VDD

5V supply voltage output

24

VSS

Digital signal ground

25

AGND

Analog signal ground

26

RSET

Reference current setting. Connected externally with a resistor to AGND. The value of the resistor

determines all internal current sources and sinks.

27

COS

Oscillator pin, connected externally with a capacitor to AGND. The value of the capacitance determines

the chopper frequency and the baud rate for data reception.

28

NC

Not connected