PNI SENtral MandM - Manual (Page 9)

PNI Sensor Corporation Doc #1020129 revE
SENtral M&M Technical Datasheet Page 8
3 Interface
The SENtral M&M pin-out is given in Table 3-1. Pin-outs also are given alongside the device
mechanical drawings in Section 5. See Table 2-3 for the operating ranges of DVDD, DVDD2,
and AVDD. A discussion of the communication interface follows the table.
Table 3-1: SENtral M&M Module Pin Assignments
Pin Name Description
M&M Orange,
Red, Green, &
Yellow Pin#
M&M
White
Pin #
M&M
Blue
Pin #
DVDD
Digital Supply Voltage – Sensors &
EEPROM
1 NA 2
DVDD2 Supply Voltage – SENtral 2 D1 2
AVDD Analog Supply Voltage – Sensors 7 NA 7
GND Ground 8 D2 8
SCLS I
2
C host bus SCL clock line 3 B1 3
SDAS I 2 C host bus SDA data line 5 A1 5
SDAM I
2
C sensor bus SDA data line 9 A4 9
SCLM I
2
C sensor bus SCL clock line 10 B4 10
GPIO[0] SENtral Accelerometer Interrupt -- D4 --
GPIO[1] SENtral Magnetometer Interrupt -- C4 --
GPIO[2] SENtral Gyroscope Interrupt -- A3 --
GPIO[3] Reserved -- B3 --
GPIO[4] Reserved 6 A2 6
GPIO[5] Reserved -- B2 --
GPIO[6] Host Event Interrupt 4 C1 4
SA0 Slave Address Pin 0 -- C3 --
VCAP Regulator Capacitor -- D3 --
Reserved Reserved (not connected) -- C2 1, 12, 13
Communication with the host processor is via SENtral’s I
2
C host interface, where the SENtral
M&M acts as a slave device and the host’s processor acts as the master. The host interrupt line
informs the host system when SENtral has updated measurement data. The SENtral Motion
Coprocessor on the SENtral M&M module communicates with the module’s sensors over the
sensor bus, where SENtral is the I
2
C master and the sensors are slave devices.