Datasheet

Theory of operation STPM10
32/53 Doc ID 17728 Rev 4
As indicated above, the STPM10 includes 56 CFG bits. The CFG bits are not retained when
the STPM10 supply is not available and they are cleared when a POR occurs, but they are
not cleared when a remote reset command (RRR) is sent through SPI.
Normally, some of these bits must be loaded during power-up of the application. From the
microcontroller, it could also reload the configuration and calibration values after power-on
restart.
101000 40
CHS 8
8-bit unsigned data for secondary current channel calibration.
256 values are possible. When CHS is 0 the calibrator is at -12.5% of the
nominal value. When CHS is 255 the calibrator is at +12.5%. The calibration
step is then 0.098%.
101001 41
101010 42
101011 43
101100 44
101101 45
101110 46
101111 47
(1)
110000 48
CRC 2
2-bit unsigned data for calibration of RC oscillator. (see Ta ble 5 )
CRC=0, or CRC=3 cal=0%
CRC=1, cal=+10%;
CRC=2, cal=-10%.
110001 49
(1)
110010 50 - 1 Reserved
110011 51 - 1 Reserved
110100 52 - 1 Reserved
110101 53 CRIT 1
Selection of tamper threshold:
CRIT=0: 12,5% / CRIT=1: 6,25%
110110 54 - 1 Reserved
110111 55 - 1 Reserved
1. IMPORTANT: This bit represents the MSB of the decimal value indicated in the description column.
Table 11. Configuration bit map (continued)
Address
Name
n. of
bits
Description
(1)
6-bit
binary
DEC