Asic Diagnostic Functionality; Table 4. Deployment Enable Jumpers; Figure 6. Arming Spi Daisy-Chain Configuration - STMicroelectronics MB467 User Manual

UM0178
Daisy chain configuration
Arming SPI interface shall support a daisy-chain configuration. In this configuration, the
processor can send arming commands to multiple L9658 devices without having to use
additional pins. The functioning is underline in the following figure:
Figure 6.
In order to obtained daisy-chain configuration it's enough to connect the MOSI from
microprocessor to MOSI_A of the ASIC, MISO_A to MOSI_A in fall and MOSI_A to the MISO of
the microprocessor.
4.6.2

ASIC diagnostic functionality

Diagnostic on the L9658 can be performed by disabling deployment through the signal DEPEN.
This signal is mapped to pin DEPEN1 of CPU board connector. DEPEN1 can also be manually
forced low by opening the jumper J21.
Diagnostic on the L9654 can be performed by disabling deployment through the signal DEPEN.
This signal is mapped to pin DEPEN2 of CPU Board connector. DEPEN2 can also be manually
forced low by opening the jumper J15.
L9658/L9654 are able to perform a short to battery, a short to ground, a resistance
measurement and a MOS diagnostics on their deployment drivers. A short to ground and an
open circuit conditions are distinguished using a resistance measurement. The diagnostic is
performed when a valid SPI command is received.
Table 4.
Name
J21
J15
Arming SPI daisy-chain configuration
Deployment Enable jumpers
Figure
Figure 7
Figure 7
Description
Deployment enable for L9658
Deployment enable for L9654
4 Hardware
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