L9963E datasheet(161/184 Pages) STMICROELECTRONICS

161 / 184 page

Figure 54. Maximum wire length according to wire insulator and operating frequency

6.12

Transceiver mode

L9963T is the recommended device to be used as transceiver in daisy chain topologies. Nevertheless, due to

legacy, L9963E can still be configured as a transceiver by applying proper SPI settings.

6.12.1

Configuring L9963E as transceiver

To configure L9963E as transceiver, the following connections must be applied to the power supply pins before

the device is first powered on (refer to Figure 55):

•

VBAT, VREG, VCOM and VTREF pins must be shorted together and connected to a 5V power supply

(VDD5; might be the same regulator supplying the microcontroller)

•

The NPNDRV, CAP1 and CAP2 must be left floating

•

VANA must be connected to a tank capacitor as in BMS mode

After the first powerup, MCU can force the transceiver mode by setting transceiver_on_by_up and

transceiver_valid_by_up bit.[end]

L9963E configured as transceiver:

•

Does not execute Voltage Conversion Routine

•

Does not execute Coulomb Counting Routine

•

Is sensitive to VCOM and VTREF OV/UV failures

•

Is not sensitive to VREG UV and VBAT UV/OV failures

•

Propagates any failure received via FAULT Line to the MCU through the FAULTL pin

•

Does not activate Cell Balancing

L9963E

Transceiver mode

DS13636 - Rev 12

page 161/184

L9963E Datenblatt(PDF) 161 Page - STMicroelectronics