Applied Data Systems Bitsy Plus, User Manual, Page: 23 / 68

Hardware Reference
ADS document # 110114-1001A Page 13
Pin Name Pin Type Description
29 USB+ IO
USB- 30 IO
USB Client (4.5.2)
31 GND P Ground
HP_IN 32 I Headphone connected (4.4.2, 6.2.9)
33 USB_RECONN 0 USB Client power management (4.5.2)
6
GND 34 P
connects to ground through R281(0
Ω
)
GND 36 P ground
35 STXD O MOSI
37 SRXD I MISO
39 SCLK2 O SCLK
43 SFRM2 O SS
SPI signals (4.5.3)
VBATT_POS 38 PI
VBATT_NEG 40 P
External Battery Input
(5.3.7)
41
POWERENABLE
O Power Supply Control Output (5.3.2)
/PE1 42 O Power Enable #1 for external devices (5.3.2)
44
DCIN_POS
48
PI
External Power Input
(also on J6)
45 /RQONOFF I
"Request On/Off" Switch Input
(5.3.3, 6.2.1)
46
47
49
GND P ground
BATPOS 50 PI Real-time clock backup battery (4.2, 6.2.4)
3.3.4 J4: Manufacturing Test Connector
Type: 2x3 header, 0.100-inch spacing
This header is used during manufacturing to load the ADSmartIO firmware. It is not supported for
any other use.
3.3.5 J5: JTAG Connector
Type: 1x6 header, 0.100-inch spacing
This header is used during manufacturing to program the boot flash and onboard logic. It is
intended for factory use.
3.3.6 J6: Input Power Connector
Board Connector: Molex #22-23-2021
Recommended mating connector: Molex 22-01-3027
These power inputs are also connected to J3. See Chapter 5 and section 6.2.3 for input power
specifications.
Pin Name Type Description
1 DCIN_POS PI DC Power Input
2 GND P Ground