PNI RM3100 Sensor Suite - Manual (Page 28)

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RM3100 & RM2100 Sensor Suite User Manual Page 27 of 45
5 MagI2C Operation
The primary functions of the MagI2C are:
Set the Cycle Count Registers if the default is not desired.
Initiate either a Single Measurement or Continuous Measurement.
Confirm New Data Ready.
Read the Measurement Results Registers.
Each of these steps is discussed in detail in the following sections.
Note: The MagI2C incorporates an Idle Mode to reduce power consumption. The device automatically
idles when not exchanging data or taking a measurement. The MagI2C starts in Idle Mode at power-up.
The MagI2C’s register map is given in Table 5-1. Register addresses are 7 bits. To Write to a
register, a ‘0’ followed by the 7-bit register number should be sent, followed by the register
value. To Read from a register, a ‘1’ followed by the 7-bit register number should be sent,
effectively adding 0x80 to the register number.
Table 5-1: MagI2C Register Map
Name
Register #
(Hex)
R/W
Default
(Hex)
Payload
Format
Description
POLL 00 RW 00 [7:0] Polls for a Single Measurement
CMM 01 RW 00 [7:0] Initiates Continuous Measurement Mode
CCX 04 – 05 RW 00C8 UInt16 Cycle Count Register – X Axis
CCY 06 – 07 RW 00C8 UInt16 Cycle Count Register – Y Axis
CCZ 08 – 09 RW 00C8 Uint16 Cycle Count Register – Z Axis
TMRC 0B RW 96 [7:0] Sets Continuous Measurement Mode Data Rate
ALLX 0C – 0E RW 000000 Uint24 Alarm Lower Limit – X Axis
AULX 0F – 11 RW 000000 Uint24 Alarm Upper Limit – X Axis
ALLY 12 – 14 RW 000000 Uint24 Alarm Lower Limit – Y Axis
AULY 15 – 17 RW 000000 Uint24 Alarm Upper Limit – Y Axis
ALLZ 18 – 1A RW 000000 Uint24 Alarm Lower Limit – Z Axis
AULZ 1B – 1D RW 000000 Uint24 Alarm Upper Limit – Z Axis
ADLX 1E – 1F RW 0000 UInt16 Alarm Hysteresis Value – X Axis
ADLY 20 – 21 RW 0000 UInt16 Alarm Hysteresis Value – Y Axis
ADLZ 22 – 23 RW 0000 UInt16 Alarm Hysteresis Value – Z Axis
MX 24 – 26 R 000000 Uint24 Measurement Results – X Axis
MY 27 – 29 R 000000 Uint24 Measurement Results – Y Axis
MZ 2A – 2C R 000000 Uint24 Measurement Results – Z Axis
BIST 33 RW 00 [7:0] Built-In Self Test
STATUS 34 R 00 [7:0] Status of DRDY
HSHAKE 35 RW 1B [7:0] Handshake Register
REVID 36 R -- Unit8 MagI2C Revision Identification