L5965 datasheet(51/73 Pages) STMICROELECTRONICS

номер детали	L5965

подробное описание детали	Power management for automotive vision and radar systems

PDF	73 Pages

Scroll/Zoom	100%

производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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51 / 73 page

6.6

ACTIVE mode

In ACTIVE Mode the regulators are ON and the device is controlled by SPI: SPI communication is active only in

this state. All the regulators, except the Main regulator and the ones disabled via OTP (ENx = 0), can be turned

on and off via SPI; if the device goes out from ACTIVE mode, OTP power up phase is recovered.

If a fault occurs, the device can stay in ACTIVE Mode or move to REC, depending on the regulator involved and

the kind of fault.

•

A fault that asserts RESET_B moves the IC to the REC phase. WD failure asserting RESET_B depends on

OTP bit WD_REC_en: if WD_REC_en=1, L5965 moves to REC phase;

•

if WD_REC_en=0, L5965 keeps in ACTIVE mode.

WKUP pin is continuously monitored: if the signal goes low after a filtering time, then L5965 goes back to

STANDBY state after proper Power Down phase.

When the IC is switched on for the first time, supplying VBAT1 and/or VBAT2, a fault is asserted by VBAT1_uv or

VBAT2_uv. That’s not a real fault, and it can be cleared by an SPI read&clear command.

6.7

OTP program mode

L5965 needs a programming phase of OTP (One Time Programmable) cells before starting any operation: this is

allowed by providing battery line higher than 17 V (~20 V) at VBAT1 pin, together with a dedicated SPI word.

Figure 26. OTP program flow chart

L5965

ACTIVE mode

DS12567 - Rev 3

page 51/73

L5965 датащи(PDF) 51 Page - STMicroelectronics