STPM10 datasheet(28/47 Pages) STMICROELECTRONICS

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Theory of operation

STPM10

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DocID17728 Rev 5

Figure 21: STPM10 data record map

7.17

Configuration bits

All the configuration bits that control the operation of the device (CFL and CFH data

records) can be written in a temporary way. The configuration bit values are written in the

so-called volatile memory, which are simple latches that hold the configuration data until

the power is on or until a reset condition occurs (both POR and remote reset). As indicated

in the data records table, the configuration bits are 56. Each configuration bit can be written

by sending a byte command to the STPM10 through its SPI interface. The procedure to

write the configuration bits is described in Section 7.19: "SPI interface".

Table 11: Configuration bit map

Address

Name

Number

of bits

Description(1)

6-bit

binary

DEC

000000

Reserved

000001

MDIV

Measurement frequency range selection:

MDIV=0: 4.000 MHz to 4.194 MHz

MDIV=1: 8.000 MHz to 8.192 MHz

000010

Type of internal oscillator selection:

RC = 0:crystal oscillator

RC = 1:RC oscillator

000011

Reserved

000100

Reserved

000101

PST

Current channel sensor type and gain:

if TMP=0

PST=0: primary is CT X8, secondary is not used, no tamper

PST=1: primary is shunt X32, secondary is not used, no

tamper

if TMP=1

PST=0: primary is CT X8, secondary is CT X8, tamper

PST=1: primary is CT X8, secondary is shunt X32, tamper

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