MCZ33811EG Freescale Semiconductor, MCZ33811EG Datasheet - Page 10

• Manufacturer Part Number: MCZ33811EG
• Description: IC SOLENOID MON 5-CH 16-SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MCZ33811EG

• Applications: Solenoid Monitor
• Current - Supply: 1mA
• Voltage - Supply: 7 V ~ 17 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.5mm Width)
• Product: Current Monitors
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

micro controller unit (MCU) using 16 bit Serial Peripheral
Interface (SPI) protocol. SPI serial clock frequencies up to
3.2MHz may be used when programming and reading output
status information (production tested at 3.2MHz).
illustrates the serial peripheral interface (SPI) configuration
between an MCU and one 33811.
input pin. As data is being clocked into the SI pin, status
information is being clocked out of the device by the SO
output pin. The response data received by the MCU during
SPI communication depends on the previous SPI message
sent to the device. Next SO response data is listed at the
bottom of each command table.
SPI Integrity Check
initial power-up of the VDD and RESET pins is
recommended. After initial system start-up or reset, the MCU
will write one 16-bit pattern to the 33811. The first 8 bits read
by the MCU will be the fault status (SO message 1) of the
outputs. The second 8 bits will be the same bit pattern sent
by the MCU. By the MCU receiving the same bit pattern it
sent, bus integrity is confirmed. The second 16-bit pattern the
MCU sends to the device is the a command word and will be
operated on by the device accordingly on rising edge of
implemented to ensure integrity of SPI communications. SPI
messages consisting of 16 SCLK pulses and multiples of
8 clock pulses thereafter will be acknowledged. SPI
messages consisting of other than 16 + multiples of 8 SCLK
pulses will be ignored by the device.
10
33811
ELECTRICAL CHARACTERISTICS
MICROCONTROLLER PARAMETRICS
The 33811 device directly interfaces to a 3.3V or 5.0V
Command data is sent to the 33811 device through the SI
Checking the integrity of the SPI communication with the
Important A SCLK pulse count strategy has been
MICROCONTROLLER PARAMETRICS
SPI - MCU INTERFACE DESCRIPTION
Figure 5
CS
.
system. Multiple ICs may be SPI-configured in parallel or
serial.
serial configuration, 32-clock cycles are required to transfer
data in / out of the ICs.
Two or more 33811 devices may be used in a module
Figure 6. SPI Parallel Interface with Microprocessor
Microcontroller
Microcontroller
Shift Register
Shift Register
Figures 6
Figure 5. SPI Interface with Microprocessor
Parallel
Receive
Parallel
Buffer
Ports
Ports
shows the configurations. When using the
SCLK
MOSI
MISO
MOSI
MISO
Analog Integrated Circuit Device Data
SCLK
Freescale Semiconductor
SO
CS
SI
SI
SO
SCLK
CS
SI
SO
SCLK
CS
16-Bit Shift Register
Fault Bits
33811
33811
33811