MPU-9150 View Datasheet(PDF) - Unspecified
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MPU-9150 Datasheet PDF : 50 Pages
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MPU-9150 Product Specification
Document Number: PS-MPU-9150A-00
Revision: 4.3
Release Date: 9/18/2013
7.15 Procedure for Directly Accessing the AK8975 3-Axis Compass
The AK8975 3-Axis Compass is connected to the MPU-9150 through the MPU’s Auxiliary I2C Bus. In order to
access this compass directly, the MPU-9150 should be put into Pass-Through Mode.
For further information regarding MPU-9150 Pass-Through Mode, please refer to Section 7.12.
The slave address for AK8975 is 0x0C or 12 decimal.
The MPU-9150 pin configuration for Direct Access to the AK8975 is described in the table below.
Pin Configuration for Direct Access to AK8975 3-Axis Compass
Pin Number
1
6
7
8
9
10
11
12
3, 13
15, 17,18
20
22
23
24
2, 4, 5, 14,
16, 19, 21
Pin Name
CLKIN
ES_DA
ES_CL
VLOGIC
AD0
REGOUT
FSYNC
INT
VDD
GND
CPOUT
RESV
SCL
SDA
RESV
Pin Description
Inactive. Connect to GND.
Active. Leave as NC.
(provision for option external pull-up resistor to VDD)
Active. Leave as NC.
(provision for option external pull-up resistor to VDD)
Active. Digital I/O supply voltage.
Active. Connect to GND.
Active. Connect a 100nF bypass capacitor on the board.
Inactive. Connect to GND.
Inactive. Leave as NC.
Power supply voltage and Digital I/O supply voltage
Power supply ground.
Active. Connect a 10nF bypass capacitor on the board.
Reserved. Do not connect.
Active. I2C serial clock (SCL)
Active. I2C serial data (SDA)
Reserved. Do not connect.
For detailed information regarding the Register Map of the AK8975, please refer to the MPU-9150 Register
Map and Register Descriptions document.
7.16 Internal Clock Generation
The MPU-9150 has a flexible clocking scheme, allowing a variety of internal or external clock sources to be
used for the internal synchronous circuitry. This synchronous circuitry includes the signal conditioning and
ADCs, the DMP, and various control circuits and registers. An on-chip PLL provides flexibility in the
allowable inputs for generating this clock.
Allowable internal sources for generating the internal clock are:
An internal relaxation oscillator
Any of the X, Y, or Z gyros (MEMS oscillators with a variation of ±1% over temperature)
Allowable external clocking sources are:
32.768kHz square wave
19.2MHz square wave
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