SC905A データシートの表示（PDF） - Semtech Corporation
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SC905A Datasheet PDF : 23 Pages
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SC905A
POWER MANAGEMENT
Pin Descriptions
Pin # Pin Name
1
IN2
I/O
Input
Pin Function
Input voltage terminal to VCORE LDO.
2
VCORE
Output
300mA LDO output for MSM core processor supply.
3
IN1
Input
Input voltage terminal to VPAD LDO.
4
VPAD
Output
300mA LDO PAD output to MSM I/O circuits.
5
ON
Input
Active high power on/off key. When the push button is closed it is shorted to battery.
6
HFPWR
Input
Power on input from accessory, active high.
7
SDA
Input/Output Bi-directional open drain digital I/O. I2C serial data.
8
SCL
Input
Digital input. I2C serial clock.
9
DGND
-
Digital ground.
10
DVIN
Input
Main digital input voltage terminal.
11
CHPWR
Input
Logic input. OR’d with ON and HFPWR.
12
EN_TCXO
Input
Logic input. External enable for VTCXO LDO. State is recorded in bit 0 of the status register.
13
EN_MOT
Input
Logic input. External enable for VMOT LDO. State is recorded in bit 2 of the status register.
14
VPSEL
Input
Default control for VPAD LDO supply. Ground for 2.20V default, tie high for 3.00V.
15
VCSEL
Input
Default control for VCORE LDO supply. Ground for 1.35V default, tie high for 1.80V.
16
PWRON
Output
Logic OR output of ON, HFPWR and PGOOD. Active high.
17
RESB
Output
Reset output. Active low.
18
PGOOD
Input
Logic input signal from MSM to indicate power is good, latches the SC905A on. Low disables the SC905A.
19
BP
Output
LDO bypass output. Bypass with a 0.1μF capacitor.
20
VBAT
Input
Main battery supply input terminal.
21
AGND
-
Analog ground pin.
22
VPLL
Output
LDO output for PLL power.
23
IN6
Input
Input voltage terminal for VPLL & VTX LDOs.
24
VTX
Output
LDO output for transmitter power.
25
VTCXO
Output
LDO output for TCXO power.
26
IN5
Input
Input voltage terminal for VTCXO & VRX LDOs.
27
VRX
Output
LDO output for receiver power.
28
VANA
Output
LDO output for analog power.
29
IN4
Input
Input voltage terminal to VANA LDO.
30
VCAM
Output
LDO output for camera power.
31
IN3
Input
Input voltage terminal to VCAM & VMOT LDOs.
32
VMOT
T Thermal Pad
Output
-
LDO output voltage for vibrator motor power. Can also be a general purpose output.
Pad for heatsinking purposes. Connect to ground plane using multiple vias. Not connected internally.
© 2006 Semtech Corp.
8
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