ADXL180
Rev. 0 | Page 28 of 56
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.
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
TRANSMIT SN0 BYTE
t
P
t
P
t
P
t
P
t
P
t
P
t
P
t
P
t
P
TRANSMIT SN1 BYTE
TRANSMIT SN2 BYTE
TRANSMIT SN3 BYTE
TRANSMIT MANUFACTURER ID
BYTE
TRANSMIT UREG BYTE
TRANSMIT CREG0 BYTE
TRANSMIT CREG1 BYTE
TRANSMIT CREG2 BYTE
SE 1
PHASE 3
PHASE 2
MODE 0
9 ×
t
P
07
54
4-
04
0
Figure 21. Phase 2 Mode 0 State Machine
Table 26. Mode 0 Serial Number and Configuration Data Byte Sequence
Byte 8
Byte 7
Byte 6
Byte 5
Byte 4
Byte 3
Byte 2
Byte 1
Byte 0
CREG2
CREG1
CREG0
UREG
Manufacturer
ID SN3 SN2 SN1
SN0
Table 27. Mode 0 Manufacturer ID Byte
MSB
LSB
SNPRG
SNPAR
REV2 REV1 REV0 MFGID2
MFGID1
MFGID0
