LM8322 datasheet(29/42 Pages) NSC

29 / 42 page

Please note: The data bytes which follow the command can

be reads (toward the host) or writes (toward the LM8322). In

the case of the READ_FIFO and RPT_READ_FIFO com-

mands, the number of data bytes is variable, with the last

transaction indicated by returning a negative acknowledge-

ment (NACK).

17.1 READ_ID COMMAND

The READ_ID command consists of a command byte (0x80)

from the host and two data bytes from the LM8322.

The first data byte returns the manufacturer code, and the

second byte returns the device revision level.

MANUFACTURER

REVISION

17.2 WRITE_CFG COMMAND

The WRITE_CFG command consists of a command byte

(0x81) and a data byte from the host. The data byte is loaded

into the hardware configuration register. The default state of

this register is 0x80.

IRQPST

MUX2EN

MUX2SEL

MUX1EN

MUX1SEL

Bit

Value

Description

IRQPST

IRQ is an open-drain output.

IRQ is a push-pull output.

MUX2EN

MUX2_OUT output disabled.

MUX2_OUT output enabled. This overrides any other function available on this pin.

MUX2SEL

If the MUX2 EN bit is 1, the MUX2_IN1 input drives the MUX2_OUT output.

If the MUX2 EN bit is 1, the MUX2_IN2 input drives the MUX2_OUT output.

MUX1EN

MUX1_OUT output disabled.

MUX1_OUT output enabled. This overrides any other function available on this pin.

MUX1SEL

If the MUX1 EN bit is 1, the MUX1_IN1 input drives the MUX1_OUT output.

If the MUX1 EN bit is 1, the MUX1_IN2 input drives the MUX1_OUT output.

Please note: The WRITE_CFG COMMAND defines basic

hardware operation characteristics. It should be placed at the

beginning of the initialization sequence driven from the host

device after power on. It is not recommended to change the

configuration during run time. Anytime this command is used,

it initializes important operating characteristics such as the

the GPIO port. This means that the GPIO pins must be re-

established

via

WRITE_PORT_SEL

and

WRITE_PORT_STATE commands in this case.

LM8322 Datasheet(PDF) 29 Page - National Semiconductor (TI)

LM8322 Datasheet(HTML) 29 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42

Datasheet Download

Link URL