STPM11ATR datasheet(25/43 Pages) STMICROELECTRONICS

25 / 43 page

STPM11/12/13/14

Theory of operation

25/43

The very first CFG bit, called TSTD, is used to disable any change of system signals after it

has been permanently set. During the configuration phase, each bit set to logic level 1

increases the supply current of STPM01 of about 120 µA, until the TSTD bit is set to 1. The

residual increase of supply current is 2µA per each bit set to 1. It is then recommended to

set the TSTD bit to 1 after the configuration procedure in order to keep the supply current as

low as possible.

The STPM1X can work either using the data stored in the OTP cells or the data available in

the shadow latches. This can be chosen according to the value RD Mode signal (see

paragraph 7.16 for description). If the RD is set, the CFG bits originates from corresponding

OTP shadow latches. If the RD is cleared, the CFG bits originates from corresponding OTP

anti-fuses. In this way, it is possible to temporarily set up certain configurations or

calibrations of the device then verify and change, if necessary. This exercise is extensively

used during production tests.

Each configuration bit can be written sending a byte command to STPM1X through its

configuration interface. The procedure to write the configuration bits is described in the

Configuration Interface section (7.17).

After the TSTD bit has been set, no other command can be sent to the STPM1X. This

implies that the shadow latches latches can no longer be used as source of configuration

data.

Table 14.

Configuration bits map

Address

Name

N. of

bits

DESCRIPTION (1)

6-BIT

Binary

DEC

000000

TSTD

Test mode and OTP write disable:

- TSTD=0: testing and continuous pre-charge of OTP when in read mode,

- TSTD=1:normal operation and no more writes to OTP

000001

MDIV

Measurement frequency range selection:

- MDIV=0: 4.000MHz to 4.194MHz,

- MDIV=1: 8.000MHz to 8.192MHz

000011

APL

LED pin frequency output:

- APL=0: P

- APL=1:

KMOT=0

→P/10

KMOT=1

→P/20

KMOT=2

→P/5

KMOT=3

→P/40

000101

PST

Current channel sensor type, gain and tamper selection:

STPM11/12

- PST=0: primary is Rogowsky coil x8 (x16 if ADDG=1)

- PST=1: primary is Rogowsky coil x24 (x32 if ADDG=1),

- PST=2: primary is CT x8,

- PST=3: primary is shunt x32,

STPM13/14

- PST=0: primary is Rogowsky coil x8 (x16 if ADDG=1), secondary is

Rogowsky coil x8 (x16 if ADDG=1),

- PST=1: primary is Rogowsky coil x24 (x32 if ADDG=1), secondary is

Rogowsky coil x24 (x32 if ADDG=1),

- PST=2: primary is CT x8, secondary is CT x8

- PST=3: primary is CT x8, secondary is shunt x32

000110

6 (1)

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