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SC644ULTRT Datasheet(PDF) 10 Page - Semtech Corporation |
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SC644ULTRT Datasheet(HTML) 10 Page - Semtech Corporation |
10 / 26 page SC644 0 Pin Descriptions Pin # Pin Name Pin Function IN Battery voltage input 2 PGND Ground pin for high current charge pump 3 BL3 Current sink output for backlight LED 3 — leave this pin open if unused 4 BL2 Current sink output for backlight LED 2 — leave this pin open if unused 5 BL Current sink output for backlight LED — leave this pin open if unused 6 BL4 Current sink output for backlight LED 4 — leave this pin open if unused 7 BL5 Current sink output for backlight LED 5 — leave this pin open if unused 8 BL6 Current sink output for backlight LED 6 — leave this pin open if unused 9 AGND Analog ground pin — connect to ground and separate from PGND current 0 LDO4 Output of LDO4 LDO3 Output of LDO3 2 SPIF SemPulse single wire interface pin — used to enable/disable the device and to configure all regis- ters (refer to Register Map and SemPulse Interface sections) 3 BYP Bypass pin for LDO reference — connect a 22nF ceramic capacitor to AGND 4 LDO2 Output of LDO2 5 LDO Output of LDO 6 OUT Charge pump output — all LED anode pins should be connected to this pin 7 C2+ Positive connection to bucket capacitor 2 8 C+ Positive connection to bucket capacitor 9 C- Negative connection to bucket capacitor 20 C2- Negative connection to bucket capacitor 2 T THERMAL PAD Thermal pad for heatsinking purposes — connect to ground plane using multiple vias — not con- nected internally |
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