33813 datasheet(43/54 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

33813

Table 21 defines the commands and default state of the internal registers at POR. SPI commands may be sent to the device at

any time while the device is in the Normal state.

Messages sent are acted upon on the rising edge of the CSB input.

Bit value returned equals bit value sent for this command

5.3.10 SPI Commands

There are seven SPI commands that can be issued by the MCU to:

• Do a SPI Check verification

• Read the contents of the SPI configuration registers

• Write the contents of the SPI configuration registers

• Read the contents of the SPI status registers

• Write the contents of the SPI status registers

• Read the contents of the SPI control registers

• Write the contents of the SPI control registers

5.3.10.1 SPI Registers

The SPI interface consists of a block of four 8-bit read/write registers.

There are three types of SPI registers:

• Configuration Registers - These registers allow the MCU to configure the various parameters and options for the various

functional blocks.

• Control Registers - These registers are used to command the outputs on and off and set the PWM duty cycle values.

• Status Registers - These registers report back faults and other conditions of the various functional blocks.

The following acronyms are use in the SPI table:

• OC = over-current, could be short to battery (SB)

• OV = over-voltage

• OT = over-temperature

• OL = open load

• SG = short to ground

• PWM = pulse width modulation

Table 21. SPI Command Messages

Command

Control Address Bits

Data Bits

hex

SPI Check

Read Configuration

<0000>

Internal Register Address

0/1

Write Configuration

<0000>

Internal Register Address

0/1

Read Status

<0000>

Internal Register Address

0/1

Write Status

<0000>

Internal Register Address

0/1

Read Control

<0000>

Internal Register Address

0/1

Write Control

<0000>

Internal Register Address

0/1

SPI Check

Response

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