Eurotech BitsyXb, User Manual

Page: 17 / 67

Hardware Reference
110118-0001A 17
Pin Name Pin Type Description
29 USB+ IO
USB Client (4.5.2)
USB- 30 IO
31 GND P ground
HP_IN 32 I Headphone connected (4.4.2, 6.3.8)
33
USB_RECONN
0 USB Client power management
8
(4.5.2)
GND
34
P ground
36
35 STXD O MOSI
SPI signals (4.5.3)
37 SRXD I MISO
39 SCLK2 O SCLK
43 SFRM2 O SS
VBATT_POS 38 PI External battery
(5.3.7)
VBATT_NEG 40 P
41
POWERENABLE
O Power supply control (5.3.2)
/PE1 42 O Power Enable #1 for external devices (5.3.2)
DCIN_POS
44
PI
External power
(also on J6)
48
45 /RQONOFF I
"Request On/Off" Switch
(5.3.3, 6.3.1)
GND
46
P ground 47
49
BATPOS 50 PI Real-time clock backup battery (4.2, 6.3.4)
3.3.4 J6: Input Power
Board Connector: Molex 22-23-2021
Recommended Mating Connector: 22-01-3027
These power inputs are also connected to J3. See Chapter 5 and section 6.3.3 for input power
specifications.
Pin Name Type Description
1 DCIN_POS PI DC power
2 GND P ground
8
A 1k Ω series resistor is included on USB_RECONN.