WM8945ECSSLASHR datasheet(97/169 Pages) WOLFSON

97 / 169 page

Production Data

WM8945

PD, May 2011, Rev 4.1

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

IM_TCHPD_INT

Interrupt mask for Touch Panel Pen

Down status

0 = Not masked

1 = Masked

IM_AUXADC_

INT

Interrupt mask for AUXADC Data

Ready status

0 = Not masked

1 = Masked

IM_LDO_UV_

INT

Interrupt mask for LDO

Undervoltage status

0 = Not masked

1 = Masked

Table 64 Interrupt Control

CONTROL INTERFACE

The WM8945 is controlled by writing to its control registers. Readback is available for all registers.

The Control Interface can operate as either a 2-, 3- or 4-wire interface:



2-wire (I2C) mode uses pins SCLK and SDA



3-wire (SPI) mode uses pins CS

¯¯ , SCLK and SDA



4-wire (SPI) mode uses pins CS

¯¯ , SCLK, SDA and SDOUT

Readback is provided on the bi-directional pin SDA in 2-/3-wire modes.

The device address in 2-wire (I2C) mode is 34h.

The WM8945 uses 15-bit register addresses and 16-bit data in all Control Interface modes.

SELECTION OF CONTROL INTERFACE MODE

The WM8945 Control Interface can be configured for I2C mode or SPI modes using the

CIFMODE/GPIO3 pin at power-up. The mode selection is as described in Table 66.

CIFMODE/GPIO3

INTERFACE FORMAT

Low

2 wire

High

3- or 4- wire

Table 65 Control Interface Mode Selection

After the Control Interface Mode has been configured, the MODE_GPIO register bit should be set in

order to latch the selection and to allow GPIO functions to be supported on the CIFMODE/GPIO3 pin.

After the MODE_GPIO register bit has been set, the Control Interface mode selection will remain

latched until a Software Reset or Power On Reset occurs. See “General Purpose Input / Output” for

details.

In 2-wire (I2C) Control Interface mode, Auto-Increment mode may be selected. This enables multiple

write and multiple read operations to be scheduled faster than is possible with single register

operations. The auto-increment option is enabled when the AUTO_INC register bit is set. This bit is

defined in Table 66. Auto-increment is disabled by default.

In SPI modes, 3-wire or 4-wire operation may be selected using the SPI_4WIRE register bit. In 3-wire

mode, register readback is provided using the bi-directional pin SDA. In 4-wire mode, register

readback is provided using SDOUT. The SDOUT pin may be configured as CMOS or as Open Drain

using the SPI_OD bit. In 3-wire mode the SDA pin may be configured as CMOS or as Open Drain

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