l99pm62gxp STMicroelectronics, l99pm62gxp Datasheet - Page 33

• Manufacturer Part Number: l99pm62gxp
• Description: Power Management Ic With Lin And High Speed Can
• Manufacturer: STMicroelectronics

L99PM62GXP
2.9.3
2.9.4
2.9.5
2.10
CAN sleep mode
During active mode it is possible to deactivate the CAN transceiver with a dedicated SPI
command (CR4, CAN_act = 0). The CAN transceiver remains deactivated until it is activated
again. With a deactivated CAN the receiver input termination network is disconnected from
the bus and the CANH, CANL bus lines is driven to GND. The SPLIT output is also
deactivated in this case.
CAN receive only mode
With the CAN_rec_only bit in control register 4 it is possible to disable the CAN transmitter in
active mode. In this mode it is possible to listen to the bus but not sending to it. The receiver
termination network is still activated in this mode.
CAN looping mode
If the CAN_Loop_en bit in control register 4 is set the TXDC input is mapped directly to the
RXDC pin. This mode can be used in combination with the CAN receive only mode, to run
diagnosis for the CAN protocol handler of the micro controller.
Serial peripheral interface (ST SPI standard)
A 24 bit SPI is used for bi-directional communication with the micro controller.
During active mode, the SPI
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The SPI can be driven by a micro controller with its SPI peripheral running in following
mode:
CPOL = 0 and CPHA = 0.
For this mode input data is sampled by the low to high transition of the clock CLK, and
output data is changed from the high to low transition of CLK.
This device is not limited to micro controller with a built-in SPI. Only three CMOS-compatible
output pins and one input pin is needed to communicate with the device. A fault condition
can be detected by setting CSN to low. If CSN = 0, the DO-pin reflects the global error flag
(fault condition) of the device.
Chip select not (CSN)
The input pin is used to select the serial interface of this device. When CSN is high, the
output pin (DO) is in high impedance state. A low signal activates the output driver and a
serial communication can be started. The state during CSN = 0 is called a communication
frame.
If CSN = low for t > t
the signal line for other SPI nodes.
Triggers the watchdog
Controls the modes and status of all L99PM62GXP modules (incl. input and output
drivers)
Provides driver output diagnostic
Provide L99PM62GXP diagnostic (incl. overtemperature warning, L99PM62GXP
operation status)
CSNfail
the DO output is switched to high impedance in order to not block
Doc ID 17639 Rev 3
Detailed description
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