SC643EVB SEMTECH [Semtech Corporation], SC643EVB Datasheet - Page 10

• Manufacturer Part Number: SC643EVB
• Manufacturer: SEMTECH [Semtech Corporation]

Pin Descriptions
Pin #
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
T
THERMAL PAD
Pin Name
PGND
AGND
LDO4
LDO3
LDO2
LDO1
ENL4
OUT
SPIF
C2+
C1+
BL3
BL2
BL1
BL4
BL5
BYP
C1-
C2-
IN
Pin Function
Battery voltage input
Ground pin for high current charge pump
Current sink output for backlight LED 3 — leave this pin open if unused
Current sink output for backlight LED 2 — leave this pin open if unused
Current sink output for backlight LED 1 — leave this pin open if unused
Current sink output for backlight LED 4 — leave this pin open if unused
Current sink output for backlight LED 5 — leave this pin open if unused
Enable pin for LDO4 — active high. See LDO4 Control Register Section and Programmable LDO
Outputs Section to determine how to use this pin.
Analog ground pin — connect to ground and separate from PGND current
Output of LDO4
Output of LDO3
SemPulse single wire interface pin — used to enable/disable the device and to confi gure all regis-
ters (refer to Register Map and SemPulse Interface sections)
Bypass pin for LDO reference — connect a 22nF ceramic capacitor to AGND
Output of LDO2
Output of LDO1
Charge pump output — all LED anode pins should be connected to this pin
Positive connection to bucket capacitor 2
Positive connection to bucket capacitor 1
Negative connection to bucket capacitor 1
Negative connection to bucket capacitor 2
Thermal pad for heatsinking purposes — connect to ground plane using multiple vias — not con-
nected internally
SC643
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