33888 View Datasheet(PDF) - Freescale Semiconductor

Part Name

Description

Manufacturer

33888

Quad High-Side and Octal Low-Side Switch for Automotive

Freescale Semiconductor 

Freescale Semiconductor, Inc.

CSB

SCLK

SI

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

SO

OD15 OD14 OD13 OD12 OD11 OD10 OD9 OD8 OD7 OD6 OD5 OD4 OD3 OD2 OD1 OD0

Notes 1. RST is in a logic [1] state during the above operation.

2. D15:D0 relate to the most recent ordered entry of program data into the 33888.

3. OD15:OD0 relate to the first 16 bits of ordered fault and status data out of the 33888.

Figure 4. Single 16-Bit Word SPI Communication

CSB

SCLK

SI

D15 D14 D13

SO

OD15 OD14 OD13

D2 D1 D0 D15* D14* D13*

OD2 OD1 OD0 D15 D14 D13

D2* D1* D0*

D2 D1 D0

Notes 1. RST is a logic [1] state during the above operation.

2. D15:D0 relate to the most recent ordered entry of program data into the 33888.

3. D15*:D0* relate to the first 16 bits of ordered entry data out of the 33888.

4. OD15:OD0 relate to the first 16 bits of ordered fault and status data out of the 33888.

Figure 5. Multiple 16-Bit Word SPI Communication

Serial Input Communication

SPI communication is accomplished using 16-bit messages.

A message is transmitted by the MCU starting with the MSB,

D15, and ending with the LSB, D0 (refer to Table 2, page 21).

Each incoming command message on the SI terminal can be

interpreted using the following bit assignments: the first twelve

LSBs, D11:D0, control each of the twelve outputs; the next

three bits, D14:D12, determine the command mode; and the

MSB, D15, is the watchdog bit.

Multiple messages can be transmitted in succession to

accommodate those applications where daisy chaining is

desirable or to confirm transmitted data, as long as the

messages are all multiples of 16 bits. Any attempt made to latch

in a message that is not 16 bits will be ignored.

The 33888 has six registers that are used to configure the

device and control the state of the four high-side and eight

low-side outputs (Table 3, page 21). The registers are

addressed via D14:D12 of the incoming SPI word (Table 2,

page 21).

33888

20

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

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