WM8940GEFL/V Wolfson Microelectronics, WM8940GEFL/V Datasheet - Page 62

• Manufacturer Part Number: WM8940GEFL/V
• Description: Audio CODECs Mono CODEC with Speaker Driver
• Manufacturer: Wolfson Microelectronics

Specifications of WM8940GEFL/V

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-24
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8940
w
3-WIRE SERIAL CONTROL MODE
READBACK IN 3-WIRE MODE
Table 55 Control Interface
Figure 34 3-Wire Serial Control Interface
Figure 35 Alternative 3-Wire Serial Control Timing
Table 54 Mode is GPIO Control
Auto-incremental writes are supported in 2 wire and 3 wire modes. This is enabled by default.
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.
The following two timing diagrams are also supported.
R8
GPIO
control
R9
Control
Interface
REGISTER
REGISTER
ADDRESS
ADDRESS
7
1
BIT
BIT
MODE_GPIO
AUTOINC
LABEL
LABEL
0
1
DEFAULT
DEFAULT
Selects MODE as a GPIO pin
0 = MODE is an input. MODE selects 2-
wire mode when low and 3-wire mode
when high.
1 = MODE can be an input or output
under the control of the GPIO control
register. Interface operates in 3-wire
mode regardless of what happens on the
MODE pin.
Auto-Incremental write enable
0=Auto-Incremental writes disabled
1=Auto-Incremental writes enabled
DESCRIPTION
DESCRIPTION
PD, Rev 4.2, April 2008
Production Data
62