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AN1011 Datasheet(PDF) 4 Page - STMicroelectronics |
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AN1011 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 11 page UL 1950/60950 validation AN1011 4/11 Doc ID 6254 Rev 4 UL 1950/60950 validation All ZEROPOWER, TIMEKEEPER and RTC devices are recognized by the Underwriters Laboratory Inc. UL 1950/60950 specification. The conditions for acceptance under this include the following: 1. That the devices are intended for use as components where the replacement of the battery can be performed by the operator or a trained technician. 2. That the devices are intended for use as components in low voltage, isolated, secondary circuits; where the case temperature does not exceed 100 °C, and the voltage on any pin, relative to ground, does not exceed 7 VDC. 3. That the devices are intended to be mounted on a printed wiring board, flame rated to a minimum of 94 V-1. 4. That the devices are provided with an appropriate on-chip, reverse current protection circuit. (See Figure 3 for the circuit diagram.) Figure 3. Battery control circuit 1. RA is the ESD protection resistor and RB is the battery protection resistor required by UL. 2. Depending on the device, switchover will be a function of battery voltage or set by a fixed reference. AI02520 VSO VCC P BATTERY RA (1) RB (1) VSO P INTERNAL VCC (ON when VCC is below the switchover voltage)(2) (OFF when VCC is below the switchover voltage) (2) |
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