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PV88080 Datasheet(PDF) 39 Page - Dialog Semiconductor

Part # PV88080
Description  High Efficiency Advanced Feature 4-Channel PMIC
PDF  102 Pages
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Manufacturer  DIALOG [Dialog Semiconductor]
Direct Link  http://www.dialog-semiconductor.com/
Logo DIALOG - Dialog Semiconductor

PV88080 Datasheet(HTML) 39 Page - Dialog Semiconductor

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PV88080
High Efficiency Advanced Feature 4-Channel PMIC
Datasheet
Revision 1.0
13-Jun-2017
CFR0011-120-00
39 of 102
© 2017 Dialog Semiconductor
5.7
Thermal Sensing and Power Fail Function
The internal comparator shown in Figure 33 and Figure 34 can be used to support multiple functions.
Among these are power fail and thermal sensing. Figure 33 and Figure 34 illustrate how to connect
GPIO2 pin to external passives to implement these two functions.
Figure 33 shows a typical NTC interface connected to the PV88080. This function provides thermal
sensing for the system with an external NTC thermistor mounted on the system PCB where thermal
conditions need to be sensed. With proper OTP setting, the PV88080 PMIC can source a 10 uA
current through the GPIO2 pin. The voltage generated by the 10uA current source multiplied by the
resistance (external resistor + external thermistor) at the pin GPIO2 is compared to the internal 1.2 V
voltage reference. If GPIO2 voltage is smaller than the internal 1.2 V VREF, the PMIC will assert the
nIRQ pin to the SOC system as an alert signal. The GPIO2 pin can also support power fail detection
when configured as shown in Figure 34.
GPIO(GPO) cell
GPIO2
PV88080
VREF (1.2V)
Digital
External NTC thermistor
LDO2.5V
External
resistor
nIRQ
10uA
SOC
Alarm
Figure 33: Typical application schematic of Thermal Sense Function
GPIO(GPO) cell
GPIO2
PV88080
VREF (1.2V)
Digital
LDO2.5V
R2
nIRQ
10uA
SOC
Alarm
R1
VPowerFial
R1+R2
R2
X
< 1.2
nIRQ threshold voltage
when :
VPowerFial
Figure 34: Typical application schematic of Power fail function



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