PNI SENtral MandM - Manual (Page 15)

PNI Sensor Corporation Doc #1020129 revE
SENtral M&M Technical Datasheet Page 14
4.1 Power-Up
After powering up or issuing a ResetReq command, SENtral automatically initializes the
registers and loads the SENtral Configuration File from the onboard EEPROM, as indicated
in Figure 4-1. The Configuration File contains information specific to the particular SENtral
M&M flavor, and is discussed more thoroughly in the SENtral Motion Coprocessor
Technical Datasheet. Once the upload is complete, SENtral enters Initialized State and waits
for instructions from the host.
Table 4-1: Configuration File Upload from EEPROM Registers
Register Name Address Register Value
SentralStatus 0x37
[0] EEPROM. 1 = EEPROM detected
[1] EEUploadDone. 1 = EEPROM upload completed
[2] EEUploadError. 1 = Calculated CRC of EEPROM is
incorrect. Only valid when EEUploadDone = 1.
[3] Idle. 1 = Device in Unprogrammed or Initialized state.
[4] NoEEPROM. 1 = No EEPROM detected.
ResetReq 0x9B [0] ResetRequest. 1 = Emulate a hard power down/power up.
The host should confirm a successful EEPROM upload by following the steps below:

Read the value from the SentralStatus register.

Check bit [0], the EEPROM bit, to ensure an EEPROM is detected by SENtral.
 Check bit [1], the EEUploadDone bit. If this is ‘0’ then the Configuration File upload
is not complete, and reread the SentralStatus register until bit [1] = 1.
 Once bit [1] = 1, check bit [2], the EEUpload Error bit. If this is ‘0’, then the upload
was successful.
If the Configuration File upload failed, send a Reset command by writing 0x01 to the
ResetReq register or power off/power on the device. If the issue persists, refer to the SENtral
Motion Coprocessor datasheet for debugging hints.
4.2 Initial Register Set-Up
After the initialization process is complete, it is necessary to configure a few of SENtral’s
registers before running in Normal Operation. These registers are given in Table 4-2.