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AS1320-T Datasheet(PDF) 8 Page - ams AG |
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AS1320-T Datasheet(HTML) 8 Page - ams AG |
8 / 12 page www.austriamicrosystems.com Revision 1.03 8 - 12 AS1320 Data Sheet - D e t a i l e d D e s c r i p t i o n Low-Battery Cutoff The AS1320 SHDNN trip threshold (1.228V) can be used as an input voltage detector that disables the device when the battery input voltage falls to a pre-set level. An external resistor-divider network can be used to set the battery- detection voltage (see Figure 16). Figure 16. Low-Battery Cutoff Application Diagram For the resistor-divider network shown in Figure 16, calculate the value for R1 by: R1 = R2 x ((VOFF/VSHDNN) - 1) (EQ 1) Where: VOFF is the battery voltage at which the AS1320 shuts down. VSHDNN = 1.228V The value of R2 should be between 100k Ω and 1MΩ to minimize battery drain. Note: Input ripple can cause false shutdowns, therefore to minimize the effect of ripple, a low-value capacitor from SHDNN to GND should be used to filter out input noise. The value of the capacitor should be such that the R/C time constant is > 2ms. Power-On Reset The AS1320 provides a power-on reset output (RESETN) that goes high-impedance when the output reaches 90% of its regulation point. RESETN goes low when the output is below 90% of the regulation point. A 100k Ω to 1MΩ pullup resistor between pin RESETN and pin OUT can provide a microprocessor logic control signal. Note: Connect pin RESETN to GND when the power-on reset feature is not used. +1.5 to +3.5V Battery +3.3V Output COUT 22µF CIN 22µF L1 10µH Power-On Reset R3 100k Ω 10nF R1 220k Ω R2 1M Ω AS1320 4 LX 3 GND 2 BATT 6 RESETN 1 SHDNN 5 OUT |
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