KIT33937AEKEVBE Freescale Semiconductor, KIT33937AEKEVBE Datasheet - Page 39

• Manufacturer Part Number: KIT33937AEKEVBE
• Description: Power Management Modules & Development Tools 3-PHASE FET PRE-DRIV
• Manufacturer: Freescale Semiconductor
• Type: MOSFET & Power Driverr

Specifications of KIT33937AEKEVBE

• Interface Type: SPI
• Product: Power Management Modules
• Silicon Manufacturer: Freescale
• Silicon Core Number: MC33937
• Kit Application Type: Power Management
• Application Sub Type: FET Driver
• Kit Contents: Board, CD
• Rohs Compliant: Yes
• For Use With/related Products: MC33937

IC Initialization
MAIN LOOP
Interrupt Handler
corrective action (if needed), clear the fault and return.
to read SR1, SR2 or SR3, may experience an interrupt between sending the SPI command and the subsequent read. Thus if
these registers are to be read, special care must be taken in the software to ensure that the correct results are being interpreted.
Analog Integrated Circuit Device Data
Freescale Semiconductor
1. Apply power (V
2. Remove RST (EN1 and EN2 are still low)
3. Initialize registers
4. Bring EN1 & EN2 high
5. Initialize the outputs
1. While (forever)
2. END
1. Interrupt Service Routine:
2. Process Bits in SR0 and correct any faults
3. Send CLINT0 command to clear known (i.e. processed faults from SR0) faults 0:3
4. Send CLINT1 command to clear processed faults 4:7. Note, the return SR0 register from this command is actually read in
5. Re-enable interrupts from the 33937
Here is a possible flow to initialize the IC and its software environment.
When an interrupt occurs, the general procedure is to send NULL0 and NULL1 commands to determine what happened, take
Because the return value from an SPI command is actually returned in the subsequent message, main-loop software that tries
1.1. With RST still low, V
2.1. When RST rises above the threshold, the IC will power-up. The charge pump (if configured) will start, and V
2.2. V
2.3. Initialize interrupt handler for MCU
2.4. Interrupt will occur because of the RESET (Interrupt processing will occur here)
3.1. Initialize MASK register by sending 0010 xxxx or 0011 xxxx to mask out unwanted interrupts.
3.2. Set desired dead time either by commanding zero dead time or calibrating the dead time.
3.3. Send MODE command with desired bits, and also the Lock bit. e.g. 01000001. This prevents further mode changes.
5.1. Command all Px_LS and Px_HS to logic 1 simultaneously (command ON Low Side, sequentially switching the phases
5.2. Command all Px_LS and Px_HS to logic 0 simultaneously (command ON High Side)
5.3. Command all Px_LS and Px_HS to logic 1 simultaneously (command ON Low Side)
5.4. The device is now ready for operation.
1.1. Send SPI messages (except NULL1-3), read results
1.2. If sending NULL1-3 messages, use a semaphore to detect interrupts
1.1. Disable further interrupts from the 33937
1.2. Clear semaphore set in 1.2.1 of Main loop. This indicates to the main loop that an interrupt occurred and that the
1.3. Send NULL0 Command. Ignore return value (the previous command is unknown)
1.4. Send NULL0 Command. The return value will be SR0 from the previous NULL0 command
the main routine.
current.
V
will reduce the transient with very large bootstrap capacitors and may prevent an unintended reset)
return value it gets may not be as expected.
LS
DD
1.2.1. Set Semaphore flag in RAM
1.2.2. Send NULL1-3
1.2.3. Send NULL0, read SR1-3
1.2.4. If Semaphore is still set, then result is good, else go to 1.2.1 (because an interrupt has gotten in the way)
1.2.5. Clear semaphore
will stabilize.
will rise as the internal regulator charges the external reservoir capacitor and the IC will come out of reset.
SYS
) to module
SUP
and V
SYS
current will be low because it will only be leakage and the small hold off bias
LOGIC COMMANDS AND REGISTERS
FUNCTIONAL DEVICE OPERATION
PWR
33937
and
39