Phase 2: Mode Description - Analog Devices ADXL180 iMEMS Manual

ADXL180

PHASE 2: MODE DESCRIPTION

Mode 0
The Mode 0 option for Phase 2 transmits the entire contents of
the configuration registers, the serial number and the manufac-
turer ID byte. The total number of messages transmitted during
Phase 2, Mode 0 is 9.
Table 26. Mode 0 Serial Number and Configuration Data Byte Sequence
Byte 8 Byte 7
CREG2 CREG1
Table 27. Mode 0 Manufacturer ID Byte
MSB
SNPRG SNPAR
t
9 ×
P
Figure 21. Phase 2 Mode 0 State Machine
Byte 6 Byte 5
CREG0 UREG
REV2 REV1
Asynchronous Mode
The device data is transmitted at a time interval of 456 μs based
on the internal clock of the ADXL180. The 456 μs period is
twice the normal transmission time interval of 228 μs.
Synchronous Mode
In synchronous mode, the device data is transmitted in
response to the synchronization pulse generated by the control
module. See the Synchronization Pulse Detection section.
PHA SE 1
TRANSMIT SN0 BYTE
t
P
TRANSMIT SN1 BYTE
t
P
TRANSMIT SN2 BYTE
t
P
TRANSMIT SN3 BYTE
t
P
TRANSMIT MANUFACTURER ID
BYTE
t
P
TRANSMIT UREG BYTE
t
P
TRANSMIT CREG0 BYTE
t
P
TRANSMIT CREG1 BYTE
t
P
TRANSMIT CREG2 BYTE
t
P
PHASE 3
Byte 4 Byte 3
Manufacturer ID SN3
REV0 MFGID2
Rev. 0 | Page 28 of 56
PHASE 2
MODE 0
Byte 2 Byte 1
SN2 SN1
MFGID1
Byte 0
SN0
LSB
MFGID0