L9788 datasheet(43/264 Pages) STMICROELECTRONICS

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DS12308 Rev 4

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L9788

Operation behavior

263

3.4.2

Smart Reset RSTC pin

The RSTC pin is an output active low. As output pin the Smart Reset circuit takes into

account several events in the device in order to generate the proper reset signal at RST pin

for the microcontroller and for portion of the internal logic as well.

The RSTC activates on the contributions specified by the reset matrix:

3.4.3

After run reset

Figure 16. RSTN/RSTC after run reset timing

As output:

4.8 ≤ VB_IN ≤ 18 V, Tj -40 to 175 °C unless otherwise specified;

As input:

4.8 ≤ VB_IN ≤ 18V, 4.5 ≤ VDD_IO ≤ 5.5 V, Tj -40 to 175°C unless otherwise specified;

GADG2511161017PS

KEY_IN_DET

RSTN/RSTC

TNL

WAKE_IN_DET or

WAKE_UP_EOT_DET or

WAKE_UP_CAN_DET or

PHOLD active

Table 16. Smart reset circuit electrical characteristic table 1

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

VUV_LO RSTN

Output low voltage

1 < VDD5 < VDD_UV

0.6

RSTN

VUV_LO RSTC

Output low voltage

1 < VDDIO< VDDIO_UV

0.6

RSTC

IUVres_max_RSTN

Input current

VDD5 = VDD_UV

VUV_reset = 0,6V

mA RSTN

IUVres_max_RSTC

Input current

VDDIO= VDDIO_UV

VUV_reset = 0,6V

mA RSTC

Table 17. Smart reset circuit electrical characteristic table 2

Symbol

Parameter

Test condition

Min

Typ

Max

Unit

RST_L

RST input low voltage

-0.3

1.1

RSTN

RST_H

RST Input high voltage

2.3

VDD_IO

+0.3

VRSTN

Trst_flt_RST Reset RST filter time

Tested by scan

7.5

11.5

µs

RSTN

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