DS2715 Dallas Semiconducotr, DS2715 Datasheet - Page 12

• Manufacturer Part Number: DS2715
• Description: NiMH Battery Pack Charge Controller
• Manufacturer: Dallas Semiconducotr

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
Package Information
For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo.
LED1 +
LED1
LED2
LED2
High-Z = High Impedance
BATTERY
High-Z
High-Z
High-Z
NO
50% duty cycle
50% duty cycle
Blinks at 1HZ,
Blinks at 1HZ,
CHARGING
High-Z
CHARGE STATE
12 of 12
DONE
High-Z
Low
Low
50% duty cycle
50% duty cycle
Blinks at 4Hz,
Blinks at 4Hz,
FAULT
High-Z
DISCHARGE
MODE
High-Z
High-Z
High-Z