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L9965TS Datasheet(PDF) 45 Page - STMicroelectronics |
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L9965TS Datasheet(HTML) 45 Page - STMicroelectronics |
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45 / 62 page  Figure 18. FLT pin structure 5.9.3 WKP The WKP pin is a high voltage output pin that provides a voltage VB - VWKP_DROP to enable external regulators (SBC, PMIC) used to power the microprocessor and VIO pin as shown in figure below. Figure 19. WKP pin application circuit When WKP PMOS pullup is not activated, WKP pin is in high impedance, and the external circuitry defines the pin voltage (in the typ. application circuit, 100 kΩ resistor to GND is used). WKP PMOS pullup is triggered: • When a FAULT/WAKEUP tone is received on VIF in DEEP_SLEEP, CYCLIC_WAKEUP and CYCLIC_COUNT. In this case the device moves to NORMAL state and WKP pin is asserted • In NORMAL mode, WKP can be asserted by setting bit WKP_SET =1 (in GEN_CFG4 register). WKP function can be disabled configuring WKP_DIS=1 (in GEN_CFG4 register); the default value is WKP_DIS=0. In NORMAL mode, the WKP pin operates accordingly to the following table: L9965T/L9965TS Functional description DS14987 - Rev 1 page 45/62 |
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