MCZ33905BS3EK Freescale Semiconductor, MCZ33905BS3EK Datasheet - Page 47

• Manufacturer Part Number: MCZ33905BS3EK
• Description: IC SBC CAN HS 3.3V 32SOIC
• Manufacturer: Freescale Semiconductor

Specifications of MCZ33905BS3EK

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Principle
V
Mode, the device will generate a periodic INT pulse.
acknowledge the INT by sending SPI commands before the
end of the next INT period in order to keep the process going.
remains in LP V
are issued properly. When no/improper SPI commands are
sent, the device will cease Cyclic INT operation and leave LP
V
into Normal Request Mode.
similar as in LP V
Operation
cyclic Interrupt period (SPI command without parity bit)].
Mode.
Analog Integrated Circuit Device Data
Freescale Semiconductor
DD
DD
This function can be used only in LP V
When Cyclic INT is selected and device is in LP V
Upon reception of the INT pulse, the MCU must
When Cyclic INT is selected and operating, the device
VDD current capability and VDD regulator behavior is
Cyclic INT period selection: register timer B
SPI command in hex 0x56xx [example; 0x560E for 512ms
This command must be send while the device is in Normal
ON).
ON Mode by issuing a reset. The device will then enter
with Cyclic INT
SPI
INT
Prepare LP V
Timer B
NORMAL MODE
Legend for SPI commands
Write Timer B, select Cyclic INT period (ex: 512 ms, 0x560E)
Write Device Mode: LP V
Read RNDM code
Write RNDM code inv.
SPI Wake-Up: 0x5C10
ON Mode
DD
LP V
DD
DD
ON Mode, assuming the SPI commands
DD
ON Mode.
ON
Cyclic INT period
1st period
CYCLIC INT OPERATION DURING LP VDD ON MODE
DD
ON with Cyclic INT enable (example: 0x5C90)
Cyclic INT period
DD
2nd period
In LP V
Figure 29. Cyclic Interrupt Operation
ON Mode (LP
DD
LP V
ON with Cyclic INT
DD
DD
ON
Cyclic INT period
ON MODE
3rd period
using the following command: MOSI 0x1B00 device report on
MISO second byte the RNDM code (MISO bit 0-7).
inverted: 0x5A RNDb.
set in LP V
command is necessary until the first INT pulse occurs. The
acknowledge process must start only after the 1st INT pulse.
Wake-Up from LP V
enter into Normal Request Mode.
device is in LP V
device will cease Cyclic INT operation and leave LP V
Mode by issuing a reset. The device will then enter into
Normal Request Mode.
Cyclic Interrupt operation.
SPI commands to acknowledge INT: (2 commands)
- read the Random code via the watchdog register address
- write watchdog refresh command using the random code
These commands can occur at any time within the period.
Initial entry in LP Mode with Cyclic INT: after the device is
Leave LP Mode with Cyclic INT:
This is done by a SPI Wake-Up command, similar to SPI
Improper SPI command while Cyclic INT operates:
When no/improper SPI commands are sent, while the
The figure below
Leave LP V
CYCLIC INT OPERATION DURING LP VDD ON MODE
DD
ON Mode, with cyclic INT enable, no SPI
DD
DD
ON and Cyclic INT due to improper operation
LP V
SPI
RST
INT
ON Mode with Cyclic INT enable, the
DD
(Figure
DD
ON Mode: 0x5C10. The device will
acknowledge SPI command
ON MODE
Cyclic INT period
Cyclic INT period
FUNCTIONAL DEVICE OPERATION
29) describes the complete
Improper or no
V
DD
ON Mode
Leave LP
MODE
NORMAL
REQUEST
RESET and
NORMAL
REQUEST
MODE
33903/4/5
DD
ON
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