PNI SENtral - Manual (Page 12)

PNI Sensor Corporation Doc #1018049 R03
SENtral Technical Data Sheet Page 11
Table 3-2: Recommended Power Line Distance from Magnetometer
Current (mA)
Recommended
Distance (mm)
2 0.2
10 1
50 5
100 10
200 20
3.4 Dedicated EEPROM (Optional)
A crucial step in using the SENtral coprocessor is uploading the SENtral Configuration File
into SENtral’s RAM. This file contains information on how the sensor system is configured
in the user’s system, and is generated with the SENtral Configuration Tool, as discussed in
Section 6. The Configuration File can be manually uploaded from non-volatile memory in
the host CPU or automatically uploaded from a dedicated EEPROM. The primary
advantages of using a dedicated EEPROM are freeing up host processor memory and
minimizing the time from power-up until the upload is complete. The advantages of using
host CPU memory are no additional cost and no additional system footprint requirement.
If implementing a dedicated EEPROM, connect it to SENtral as a slave device on the sensor
bus, in parallel with the sensors shown in Figure 3-1. The EEPROM upload rate should be
set with the SENtral Configuration Tool (see Section 6.1.3). Faster is generally better,
although the sensor bus rate is limited to 1 Mb/sec. Writing the Configuration File onto the
EEPROM can be accomplished either using an EEPROM programmer or by writing to the
EEPROM from the host while SENtral is in Pass-Through State.
The primary EEPROM requirements are:

≥320 Kbit (40 Kb x 8 bits) of memory.

Shifted address of 0xA0, 0xA2, 0xA4, 0xA6, 0xA8, or 0xAA. (Unshifted address of
0x50, 0x52, 0x54, 0x56, 0x58, or 0x5A.)
The following devices have been used with SENtral, but this list is not exhaustive.

Microchip 24LC256T-I/SN

ST M24M01-DRCS

Renesas R1EX24512ASAS0A