Digilent Pmod CMPS2 Manuel de référence - Page 3
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Pmod CMPS2™ Reference Manual
1.1
Pinout Table Diagram
Header J1
Pin
Signal
1
N/C
2
N/C
3
SCL
4
SDA
5
GND
6
VCC
1.2
Physical Dimensions
The pins on the pin header are spaced 100 mil apart. The PCB is 1.25 inches long on the sides parallel to the pins on
the pin header and 0.8 inches long on the sides perpendicular to the pin header.
2
Functional Description
The Pmod CMPS2 utilizes the MMC34160PJ to collect magnetic field data. While communicating with the host
board via the
device.
2.1
Serial Communication
The Pmod CMPS2 communicates with the host board via the I²C protocol. By first sending the 7-bit I²C device
address of 0110000 and then a read/write bit (high/low logic level, respectively), followed by the register address
of interest at a maximum clock frequency of 400 kHz users can both configure and read from the Pmod CMPS2. An
additional set of pins on header J2 is provided so that users may daisy chain the Pmod CMPS2 with other I²C
devices.
2.2
Register Details
2.2.1 Data Registers
Each Cartesian axis has two registers to store the high and low data bytes for each measurement. The data
registers are arranged in a low byte, high byte arrangement.
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Header J2
Description
Pin
Not Connected
1
Not Connected
2
Serial Clock
3
Serial Data
4
Power Supply
5
Ground
Power Supply
6
(3.3V)
I²C protocol
using an I²C address of 0x0110000/ users can measure the ±16 G field surrounding the
Data Registers addresses 0x00 to 0x05
Address
0x00
0x01
Signal
Description
N/C
Not Connected
N/C
Not Connected
SCL
Serial Clock
SDA
Serial Data
GND
Power Supply
Ground
VCC
Power Supply
(3.3V)
Register Name
X out LSB
X out MSB
Jumper JP1
Pin
Status
Description
SCL
Loaded
4.7 kΩ Pullup
to Vcc
SCL
Unloaded
No Pullup to
Vcc
SDA
Loaded
4.7 kΩ Pullup
to Vcc
SDA
Unloaded
No Pullup to
Vcc
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