SPSB081 datasheet(19/137 Pages) STMICROELECTRONICS

19 / 137 page

In standby modes, the inputs are configurable with an internal pull-up or pull-down current source according to

the setup of the external contact. Moreover, in case of cyclic sensing, an internal pull-down resistor (RWU_ACT) is

periodically activated on each rising edge of the TIMER_ON. RWU_ACT is activated also for static wake-up, but in

this case it occurs just after WU request (see the figure above), keeping this condition for at least the filter time

tWU_STAT (or more, if the WU is valid and the device enters in active mode).

In active mode, the inputs have in fact only the internal pull-down resistor and the input status can be read by SPI.

Static sense should be configured before the read operation is started to reflect the actual input level.

Being DIR/WU2_EN enable bit, in config register (0x3F), set to 0 by default, the DIR/WU2 pin is configured

as wake-up function. If DIR/WU2_EN enable bit is set to 1 the DIR/WU2 pin is a low voltage direct driving of

OUT1..4. Threshold is set in this case at 1.5 V.

3.5

Functional overview (truth table)

Table 8. Functional overview

Version

Function

Comments

Operating modes

Active mode

V1_standby static

mode (cyclic sense)

VBAT_standby static

mode (cyclic sense)

3.4.1

Voltage regulator V1

VOUT = 5 V/3.3 V

On(1)

Off

3.4.2

Voltage regulator V2

VOUT = 5 V/3.3 V

On/Off(2)

On(2)/Off

3.4.3

Reset generator

Off

3.4.4

Window watchdog

V1 monitor

Off (On if IV1 > ICMP and

ICMP = 0)

Off

3.4.5

Wake-up

Off

Active(3)

3.4.6

HS-cyclic supply

Oscillator time base

On/Off

On(2)/Off

3.4.7

LIN

LIN ISO 17987-4/2016

On(2)

Off(4)

3.4.8

CAN FD

On/Off(5)

Off(4)

3.4.9

Oscillator

On/Off(6)

3.4.10

VS monitor

On(7)

On/Off(7)

3.4.11

OUT1 (P-channel HS)

On/Off(2)

3.4.12

OUT2 (P-channel HS)

On/Off(2)

3.4.13

OUT3 (P-channel HS)

On/Off(2)

On/ Off(2)

On/Off(2)

3.4.14

OUT4 (P-channel HS)

On/Off(2)

On/ Off(2)

On/Off(2)

3.4.15

Thermal shutdown

TSD2

Off

3.4.16

Thermal shutdown

TSD1x (for P-channel

HS)

On(8)

On/Off(2)

1. Supply the processor in low current mode.

2. According to SPI setting.

3. Unless disabled by SPI.

4. The bus state is internally stored when going to standby mode. A change of bus state will lead to a wake-up after exceeding

of internal filter time (if wake up by LIN or CAN is not disabled by SPI).

5. After power-on, the CAN FD transceiver is in ‘CAN Trx standby’ mode. It is activated by SPI command (CAN_ACT = 1).

6. ON, if is enabled at least one of the following: cyclic sense, OUT1, OUT2, OUT3, OUT4, V2.

7. ON when at least one OUTx is enabled and OFF when OUTx are disabled.

8. V1, V2, OUT1, OUT2, OUT3, and OUT4 are thermal monitored.

SPSB081

Functional overview (truth table)

DS14048 - Rev 3

page 19/137

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