PNI SENtral MandM - Manual (Page 21)

PNI Sensor Corporation Doc #1020129 revE
SENtral M&M Technical Datasheet Page 20
Table 4-5: Standby Registers
Register Name Address Register Value
AlgorithmControl 0x54
[0] 1 = StandbyEnable
0 = Disable Standby State
AlgorithmStatus 0x38
[0] 1 = SENtral in Standby State
0 = SENtral not in Standby State
The steps to enter and exit Standby State are given below:

Write 0x01 to the AlgorithmControl register. This places SENtral in Standby State.

Read the AlgorithmStatus register. If bit [0] is ‘1’, then SENtral is in Standby State.
This step is optional.

When you are ready to exit Standby State, write 0x00 to the AlgorithmControl
register. This takes SENtral out of Standby State and normally will place it back into
Normal Operation.

Read the AlgorithmStatus register. If bit [0] is ‘0’, then SENtral is not in Standby
State. This step is optional.
4.5 Pass-Through State
In Pass-Through State, SENtral’s sensor and host interfaces are connected by internal
switches so the host system can communicate directly with the sensors or EEPROM. To
enter Pass-Through State, SENtral first either should be in Standby or Initialized State.
Consequently, in Pass-Through State the SENtral algorithm, host interrupt line, and sensors
are disabled, unless a sensor is directly turned on by the host. When exiting Pass-Through
State, SENtral will return to its prior state.
Note: When entering Pass-Through State the sensor’s registers retain the values established by
SENtral, and when exiting Pass-Through State any register changes will be retained.
Uses for the Pass-Through State include:

Direct control of sensors, if desired.

Debugging.

Communication with the dedicated EEPROM, if implemented. Specifically, if a new
Configuration File is generated, the host can write this into the EEPROM when in
Pass-Through State, as discussed in the SENtral Motion Coprocessor datasheet.