A927ZET Technical Information Manual
30
Temperature memory size (ext): 4096 words
Battery memory size: 256 words
Control
Control register is the main configuration register. The behaviour of the sensor is mainly dependent on this register.
Also resetting of sensor is done through one specific bit of this register.
Temperature Control Register (int) [15:00]
User
Bank:11b
Word addr: 11h
R /W
Temperature Control Register (ext) [15:00]
User
Bank:11b
Word addr: 1021h
R /W
Battery Control Register [15:00]
User
Bank:11b
Word addr: 2031h
R /W
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
RFU
Reserved for Future Use
MM
SD
R
ST
L
D
TL
M
LH
M
LLM
RFU
MM – Memory Management
MM bit is used to control the tag behaviour in case of full memory. If this bit is clear, when the memory is full, the tag
starts overwriting the memory: the tag retains the newer samples. It this bit is set, when the memory is full, the tag
stops its logging activity: the tag retains the older samples. Default value is 0.
SD – Set Date
SD bit has to be set after saving the StartTime. Default value is 0.
RST - Reset
This bit has to be set when starting the new log. After tag receives a new configuration record with RST bit activated, it
will reset the Samples register and do all the necessary operations to start a new log. It is automatically cleared by the
tag when the required operation has been completed. Default value is 0.
L - Sensor Monitoring activated
L bit is used to control the sensor monitoring. If this bit is zero, the actual sensor value is never read. This bit turns on
the system. If bit is activated, the sensor value is measured with interval defined in Sample Time register. Logging
decision is done after measurement and it is dependent on the D/TL bit configuration. Default value is 0.
D - Data Logging activated
D bit is used to define if sensor value is stored into memory in case of data record is created. In most cases this bit
needs to be set. If the time-stamp of specific event is the only concern, this bit can be left cleared. Default value is 0.
TL - Time stamp activated
TL bit is used to define if time-stamp is stored into memory when a data record is created. Default value is 0.
M - Mode
M bit is used for operating mode. Zero means continuous logging. Data record is created and logged always when
sensor value is read (defined by Sample Time register). Bit one means that data record is created and logged only when
limits are violated (and limit monitoring is turned on). Default value is 0.
LHM - Limit High Monitoring (on/off) / LLM - Limit Low Monitoring (on/off)
LHM and LLM bits are used to turn on/off the limit monitoring. This can be done even in continuous logging mode. In
this case the limit violation flags in Status register are raised during logging (if limits are violated). It is fast to check the
flags to determine if limits have been violated without need to read the whole memory. Default value is 0.
