L9965TS datasheet(15/62 Pages) STMICROELECTRONICS

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Figure 7. Wakeup condition by SPI Slave

Wakeup frames are not decoded: their content may be arbitrary. However, it is strongly recommended to send

READ commands to avoid inadvertent write operations in case the device is already awake.

5.1.1.2

NORMAL State diagnostics

In this state several diagnostic functions are available:

1. NVM data integrity check

2. Periodic check of registers data integrity, if configured by GENERAL_REG.CYC_CRC_DIS

3. Oscillator fail

4. Oscillator stuck: if detected, logic block is immediately put under reset and the device moves to DEEPSLEEP

state (immediate reaction)

5. Oscillators monitor BIST

6. VB undervoltage

7. V3V3 overvoltage

8. V5V overvoltage

9. V5V undervoltage

10. V5V overcurrent

11. GND loss if configured by the GEN_CFG4.EN_GND_LOSS bit

12. Analog comparators BIST if configured by the GEN_CFG5.BIST_ANA_ENB = 1

a. VB undervoltage comparator analog BIST

b. V3V3 overvoltage comparator analog BIST

c. V5V undervoltage comparator analog BIST

d. V5V overvoltage comparator analog BIST

13. WKP, FLT and BNE pins diagnostics

14. Thermal-shutdown monitoring

15. VIF communication monitoring

16. SPI communication monitoring.

All the fault and events detected by L9965T/TS are latched in a corresponding status bits and can be read by the

BMS MCU through SPI communication.

The most relevant faults and events are reported, according to fault detection mask registers, in the internal GSW

(Global Status Word). The OR combination of all the bits in the GSW is signaled by the FAULT bit of the SPI

MISO frame shown in Table 26 and notified by the FLT pin (HIGH if at least one of the bits in the GSW is set) to

trigger an MCU interrupt.

Assert condition and behavior of each fault are described in detail in the related section.

5.1.2

CYCLIC_WAKEUP State

When all the BMS system is in low power mode, the L9965T/TS can be configured to automatically trigger chain

monitoring, according to the system topology (single access or ring), alternating CYCLIC_COUNT and

CYCLIC_WAKEUP states.

L9965T/L9965TS

Functional description

DS14987 - Rev 1

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