Rainbow Electronics DS2715 - Manual (Page 12)

DS2715: NiMH Cell Pack Charge Controller
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LED1 and LED2 Outputs
Open-drain outputs LED1 and LED2 pull low to indicate charge status. When inactive, the outputs are high
impedance. LED1 displays the state of charge and LED2 displays the charge results. The LED1 pin drives low in a
1Hz, 50% duty cycle “blink” pattern to indicate cells are charging. LED2 drives low with 100% duty cycle to signal a
successful charge completion or blinks at 4Hz, 50% duty cycle to signal a charging fault has occurred. Both LED
pins remain in a high-impedance state when no cells are present or the discharge latch is set. LED pins can be tied
together if only one LED display is desired. Table 3 summarizes the LED operation for each charge condition.
Table 3. LED DISPLAY PATTERNS BASED ON CHARGE STATE
CHARGE STATE
NO
BATTERY
CHARGING DONE FAULT
DISCHARGE
MODE
LED1 High-Z
Blinks at 1HZ,
50% duty cycle
High-Z High-Z High-Z
LED2 High-Z High-Z Low
Blinks at 4Hz,
50% duty cycle
High-Z
LED1 +
LED2
High-Z
Blinks at 1HZ,
50% duty cycle
Low
Blinks at 4Hz,
50% duty cycle
High-Z
High-Z = High Impedance
Package Information
For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo .