WM8985_07 WOLFSON [Wolfson Microelectronics plc], WM8985_07 Datasheet - Page 85

• Manufacturer Part Number: WM8985_07
• Description: Multimedia CODEC With Class D Headphone and Line Out
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

Pre-Production
CONTROL INTERFACE
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Table 46 Jack Detect Register Control Bits
SELECTION OF CONTROL MODE AND 2-WIRE MODE ADDRESS
Table 47 Control Interface Mode Selection
3-WIRE SERIAL CONTROL MODE
Figure 38 3-Wire Serial Control Interface
The control interface can operate as either a 3-wire or 2-wire control interface. The MODE pin
determines the 2 or 3 wire mode as shown in Table 47.
The WM8985 is controlled by writing to registers through a serial control interface. A control word
consists of 16 bits. The first 7 bits (B15 to B9) are register address bits that select which control
register is accessed. The remaining 9 bits (B8 to B0) are data bits, corresponding to the 9 data bits
in each control register.
In 3-wire mode, every rising edge of SCLK clocks in one data bit from the SDIN pin. A rising edge on
CSB/GPIO latches in a complete control word consisting of the last 16 bits.
R9 (09h)
GPIO control
R13 (00h)
REGISTER
ADDRESS
MODE
High
Low
5:4
6
3:0
7:4
BIT
JD_SEL
JD_EN
JD_EN0
JD_EN1
LABEL
INTERFACE FORMAT
2 wire
3 wire
00
0
0000
0000
DEFAULT
Pin selected as jack detection input
00 = GPIO1
01 = GPIO2
10 = GPIO3
11 = Reserved
Jack Detection Enable
0 = disabled
1 = enabled
Output enables when selected jack
detection input is logic 0.
[0]= OUT1_EN_0
[1]= OUT2_EN_0
[2]= OUT3_EN_0
[3]= OUT4_EN_0
Output enables when selected jack
detection input is logic 1
[4]= OUT1_EN_1
[5]= OUT2_EN_1
[6]= OUT3_EN_1
[7]= OUT4_EN_1
DESCRIPTION
PP, Rev 3.5, January 2007
WM8985
85