33996 datasheet(12/23 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33996

FUNCTIONAL DESCRIPTION

OPERATIONAL MODES

output being controlled ON. Diagnostics is treated in a similar

manner—outputs with a fault will feedback (via SO) to the

MCU a logic [1], while normal operating outputs will provide a

logic [0].

The 33996 may be controlled and provide diagnostics

using a daisy chain configuration or in parallel mode.

Figure 10 shows the daisy chain configuration using the

33996. Data from the MCU is clocked daisy chain through

each device while the Chip Select bit (CS) is commanded low

by the MCU. During each clock cycle, output status from the

daisy-chained 33996s is being transferred back to the MCU

via the Master In Slave Out (MISO) line. On rising edge of CS,

data stored in the input register is transferred to the output

driver. Daisy chain control of the 33996 requires 24 bits per

device.

Multiple 33996 devices can be controlled in a parallel input

fashion using the SPI. Figure 11, page 12, illustrates

potentially 32 loads being controlled by two dedicated

parallel MCU ports used for chip select.

Figure 10. 33996 SPI System Daisy Chain

Figure 11. Parallel Inputs SPI Control

MC68HCXX

Microcontroller

33996

Shift Register

Ports

Parallel

33996

SCLK

RST

PWM

MISO

SCLK

PWM1

PWM2

MOSI

SCLK

RST

PWM

Parallel

Ports

MC68HCXX

Microcontroller

33996

SCLK

MISO

MOSI

Shift Register

PWM1

PWM

RST

PWM

PWM2

RST

33996 Datasheet(PDF) 12 Page - Freescale Semiconductor, Inc

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