BitsyXb - User Manual
18
110118-0001A
3.3.5
J7: I
2
C and SD/MMC
Board Connector: 2x8 shrouded header, 2mm, Samtec STMM-108-02-G-D-SM
Recommended Board-to-Cable Connector: TCSD series
Recommended Board-to-Board Connector: ESQT series (e.g. ESQT-108-02-F-D-450)
This header supplies the signals for the I
2
C bus (4.5.4) and SD/MMC (4.5.5) interfaces. See the
respective sections in Chapter 4 for additional details about how the signals are used.
Pin
Name
Type
Description
1
I2C_SDA
IO
I
2
C bus (4.5.4)
2
I2C_SCL
IO
3
GND
P
ground
4
P
5
SD_DAT2
IO
SD/MMC signals
6
SD_DAT3
IO
7
SD_CMD
IO
8
SD_DAT0
IO
9
SD_CLK
O
10
/SD_CD
I
11
VDDX
PO
3.3 V
12
VCC
PO
5 V
13
/SD_WP
I
SD/MMC signals (4.5.5)
14
/SDIO_IRQ
IO
15
/SD_PWREN
O
16
SD_DAT1
IO
3.3.6
J8: Vee Adapter
Board Connector: 2x4 unshrouded terminal strip, 2mm, Samtec TMM-104-01-G-D-SM
Recommended Board-to-Board Connector: ESQT series (e.g. ESQT-104-02-F-D-450)
This header connects to an external Vee power supply adapter. Header J8 supplies power and
control signals to the adapter and receives the Vee output power from the adapter.
Pin
Name
Type
Description
1
VCC
PO
5 V
2
VDDX
PO
3.3 V
3
VEE_CTL
O
On/Off control of Vee power
4
VEE
PI
Vee input to BitsyXb
5
V_CON
O
PWM control of Vee
6
n/c
-
7
GND
P
ground
8
GND
P
9
Note that the STMM header is 0.050-inch higher than the other 2mm headers on the board
because it is a surface-mount part. Use a correspondingly shorter socket on mating boards.
10
Signal /SD_CD includes a 47k
Ω
pull up resistor.
