33793 datasheet(16/27 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33793

FUNCTIONAL DEVICE OPERATION

DSI COMMANDS AND RESPONSES

INITIALIZATION RESPONSE

This response message is sent during the next message

following a valid Initialization command to the addressed

device. The response is shown in Table 10. Because this is a

long-word only command, the short-word response is invalid.

REQUEST STATUS COMMAND

This command will cause the addressed device to return

the status of the NV, U, and BS bits and the logic levels of the

I/O and LOGICOUT. The command format is found in

Table 11.

REQUEST STATUS RESPONSE

This response message is sent during the next message

following a valid Request Status command to the addressed

device. The response format is found in Table 12. The high

byte is omitted during the short-word response. No response

is generated if the command address field was $0.

REQUEST VALUE n COMMAND

This command will cause the analog level at one of the

four I/O lines to be measured and returned on the following

command. The command format is found in Table 13. The

analog input measured is defined in Table 14.

Legend

A[3:0] = Address bits. The slave address.

BS = Bus Switch Position (1 = closed).

G[1:0] = Group bits (unused).

NV = Nonvolatile Memory Write. The value of the NV bit in the slave.

PA[3:0] = Bus Address to set the device to.

X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by the

master.

Table 9. Initialization Command Format

Table 10. Initialization Response Format

High Byte

Low Byte

CRC

PA3

PA2

PA1

PA0

Legend

A[3:0] = Address bits. The slave address.

BF = Bus Fault. Bus out short to battery detected.

BS = Bus Switch Position (1 = closed).

G[1:0] = Group bits (unused).

NV = Nonvolatile Memory Write. The value of the NV bit in the slave.

PA[3:0] = Bus Address to set the device to.

X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by

the slave.

Table 11. Request Status Command Format

Data

Address

Command

CRC

–

Legend

A[3:0] = Address bits. The address of the selected device. An

address value of "0000" is ignored by all devices.

X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by the

master.

Table 12. Request Status Response Format

High Byte

Low Byte

CRC

IO3

IO2

IO1

IO0

Legend

A[3:0] = Address bits. The slave address.

BS = Bus Switch Position (1 = closed).

LO = Logic out driven level.

IO[3:0] = Values at logic I/Os.

NV = Nonvolatile Memory Write. The value of the NV bit in the slave.

U = Undervoltage indicated true by a “1”.

X[3:0] = Cyclic Redundancy Check (CRC). The CRC as calculated by the

slave.

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