c8051f912-gdi Silicon Laboratories, c8051f912-gdi Datasheet - Page 3

• Manufacturer Part Number: c8051f912-gdi
• Manufacturer: Silicon Laboratories

2. Pin Definitions
XTAL3
XTAL4
DCEN
Name
C2CK
VBAT
DC– /
V
GND
GND
RST/
P2.7/
V
P0.0
DC+
C2D
DD
REF
/
Physical
Number
Pad
10
32
6
4
2
3
5
7
8
9
Table 2.1. Pin Definitions for C8051F912-GDI
D I/O or A
P Out
A Out
A Out
D I/O
D I/O
D I/O
D I/O
Type
P In
P In
P In
P In
A In
A In
G
G
G
In
Description
Battery Supply Voltage.
C8051F912 devices:
Must be 0.9 to 3.6 V in single-cell battery mode and 1.8 to 3.6 V in dual-cell
battery mode.
Power Supply Voltage. Must be 1.8 to 3.6 V. This supply voltage is not
required in low power sleep mode. This voltage must always be > VBAT.
Positive output of the dc-dc converter. In single-cell battery mode, a 1uF
ceramic capacitor is required between DC+ and DC–. This pin can supply
power to external devices when operating in single-cell battery mode.
DC-DC converter return current path. In single-cell battery mode, this pin is
typically not connected to ground.
In dual-cell battery mode, this pin must be connected directly to ground.
Required Ground.
DC-DC Enable Pin. In single-cell battery mode, this pin must be connected
to VBAT through a 0.68 µH inductor.
In dual-cell battery mode, this pin must be connected directly to ground.
Device Reset. Open-drain output of internal POR or V
nal source can initiate a system reset by driving this pin low for at least
15 µs. A 1 k to 5 k pullup to V
Clock signal for the C2 Debug Interface.
Port 2.7. This pin can only be used as GPIO. The Crossbar cannot route
signals to this pin and it cannot be configured as an analog input. See Port
I/O Section of C8051F91x-C8051F90x data sheet for a complete descrip-
tion.
Bi-directional data signal for the C2 Debug Interface.
SmaRTClock Oscillator Crystal Input.
SmaRTClock Oscillator Crystal Output.
Port 0.0.
External V
Internal V
mended.
REF
REF
Rev. 1.0
Output. External V
Input.
REF
DD
is recommended.
decoupling capacitors are recom-
C8051F912-GDI
DD
monitor. An exter-
3