L9963E datasheet(73/184 Pages) STMICROELECTRONICS

73 / 184 page

Figure 21. GPIO open resistance vs. temperature

100

150

200

250

300

350

400

450

500

TEMPERATURE [°C]

Ropen @Idiag=25uA

Ropen @Idiag=40uA

Ropen @Idiag=10uA

The proposed solution works fine in the whole cell operating temperature range. For very high and abnormal

cell temperatures (greater than 90°C), a GPIOx_OPEN failure could be triggered when performing GPIO open

diagnostic.

For further details see Section 4.12 Voltage conversion routine.

4.11.18

GPIO OT/UT (UV/OV) and fast charge OT diagnostic (GPIO3-9)

It is possible to select the value for the Overvoltage threshold (VGPIOAN_UT) as well as for the Undervoltage

threshold (VGPIOAN_OT) of the analog voltages applied on GPIO pins. These diagnostics are available for

GPIO3-9, if configured as analog input.

Dedicated OV/UT (GPIOx_UT_TH) and UV/OT (GPIOx_OT_TH) thresholds are available for each GPIO3-9.

Individual OT/UT failures can be masked via dedicated Gpiox_OT_UT_MSK mask bit.

It is also possible to specify an increment (VGPIO_FASTCH_OT_DELTA) of the undervoltage threshold VGPIOAN_OT.

This increment, programmable via Gpio_fastchg_OT_delta_thr bit, will determine the position of the Fast

Charge Undervoltage threshold (VFASTCHG_OT_TH). Purpose of this diagnostic is providing an additional OT

threshold to help MCU understanding when switching from fast charge (high DC current) to low power charge,

thus preventing excessive overheating during the battery charging process.

The failure can be masked through the Gpiox_fastchg_OT_MSK bit. The actual fast charge undervoltage

threshold will be placed according to the following formula:

VFASTCHG_OT_TH=VGPIOAN_OT+VGPIO_FASTCH_OT_DELTA

(13)

This diagnostic can be used in application to monitor Overtemperature/Undertemperature events on external

NTCs: UV is related to Overtemperature while OV is related to Undertemperature.

If voltage (measured using TCYCLEADC_000) is higher than the VGPIOAN_UT threshold or lower than VGPIOAN_OT

threshold:

•

Corresponding fault flag is set and latched into VGPIO_OT_UT register;

•

Fault is propagated through the FAULT Line;

•

Conversion routine goes into Configuration Override.

GPIO UT/OT failures can be masked via Gpiox_OT_UT_MSK bit. When masking is activated:

L9963E

Safety and diagnostic features

DS13636 - Rev 12

page 73/184

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