Advanced Information

WM8191

WOLFSON MICROELECTRONICS LTD

AI Rev 3.1 April 2001

3

PIN

NAME

TYPE

DESCRIPTION

21

OP[0]

Digital output

22

OP[1]

Digital output

23

OP[2]

Digital output

Pins OP[13:0] form a Hi-Z digital bi-directional bus. There are several modes:

Hi-Z: when OEB = 1.

14-bit output: 14-bit data is output on OP[13:0].

8-bit multiplexed output: data is output on OP[13:6] at 2

∗ ADC conversion rate.

7-bit multiplexed output: data is output on OP[13:6] at 2

∗ ADC conversion rate.

4-bit multiplexed output: data is output on OP[13:10] at 4

∗ ADC conversion rate.

See Output Formats section in Device Description for further details.

Input 8-bit: control data is input on OP[13:6] in parallel mode when SCK/RNW = 0,

and SEN/STB = 0.

Output 8-bit: register read back data is output in parallel on OP[13:6] when

SCK/RNW = 1, and SEN/STB = 0, or in serial on pin SDO when SEN/STB = 1.

24

DVDD2

Supply

Digital I/O supply (3.3V/5V).

25

DGND2

Supply

Digital ground (0V).

26

OP[3]

Digital output

27

OP[4]

Digital output

28

OP[5]

Digital output

29

OP[6]

Digital I/O

See pins 21 to 23 for details.

30

DGND3

Supply

Digital ground (0V).

31

OP[7]

Digital I/O

32

OP[8]

Digital I/O

33

OP[9]

Digital I/O

34

OP[10]

Digital I/O

See pins 21 to 23 for details.

35

DVDD3

Supply

Digital I/O supply (3.3V/5V).

36

DGND4

Supply

Digital ground (0V).

37

OP[11]

Digital I/O

38

OP[12]

Digital I/O

39

OP[13]/SDO

Digital I/O

See pins 21 to 23 for details.

If the device has been configured to use the serial interface, pin OP[13]/SDO may

be used to output register read-back data when OEB = 0 and SEN has been

pulsed high.

See Serial Interface sections in Device Description for further details.

40

DGND5

Supply

Digital ground (0V).

41

NC

No connection.

42

NRESET

Digital input

Reset input, active low. This signal forces a reset of all internal registers and selects

whether the serial or parallel control interface is used. See pin SEN/STB.

43

AVDD1

Supply

Analogue supply (5V).

44

AVDD2

Supply

Analogue supply (5V).

45

AGND5

Supply

Analogue ground (0V).

46

AGND6

Supply

Analogue ground (0V).

47

VRB

Analogue output

Lower reference voltage. This pin must be capacitively decoupled to AGND.

48

VRT

Analogue output

Lower reference voltage. This pin must be capacitively decoupled to AGND.