User's Manual

Page 21 of 31
3) The reference circuit is for Green LED, and it is the same for Red LED.
2.2.10 Others
U6100 also provides some other interfaces listed in Table 2-16.
Table 2-16 Other interfaces by U6100
1） U6100 provides PWM signal output from PWM_OUT pin of the board to board connector.
2） U6100 provides power supply output named VREG_MSMP, with value of +2.6V and Max current value of
100mA.
3） U6100 provides power supply input pin named VCOIN for backup battery. The anode of the battery connects to
VCOIN, and the cathode connects to ground. The backup battery will provide power supply for the real time clock,
Crystal Oscillator Circuit and SMPL timer while U6100 powered off. And the battery will be charged while U6100
powered on. The voltage offered by battery must be less than 3.6V. To keep the SMPL timer working while sudden
momentary power losing, a backup capacitor connected to VCOIN can be used besides battery. The correlativity
between the capacitance and the holding time is listed in Table 2-17.
Table 2-17 Correlativity between the capacitance and holding time
The capacitance The Packaging (X5R) The holding time (s)
1.5uF 0805 0.5
3.3uF 0805 1.0
4.7uF 0805 1.5
6.8uF 1206 2.0
4） KPD_PWR_N is used as power on for U6100 module. U6100 will be power on when connect KPD_PWR_N to
ground. It’s better to use a switch button to connected with KPD_PWR_N and ground, so the module can be power
Pins of
board to board connector
SN. of 60Pin board to
board connector
Description
SLIC_INT 43 Interrupt signal of peripheral device
SLIC_RESET 41 Reset signal of peripheral device
KPD_PWR_N 52 Power on key
EXT_RST_IN 53 Reset signal of U6100 module
HKADC 28 External ADC input
VREG_MSMP 45 VREG_MSMP voltage output, +2.6V
VCOIN 51 Backup battery power supply input
PWM_OUT 49 PWM output