STPM01 datasheet(23/60 Pages) STMICROELECTRONICS

23 / 60 page

STPM01

Theory of operation

Doc ID 10853 Rev 8

23/60

capacitor should be connected between VCC and VSS, VDDA and VSS, VDDD and VSS. All

these capacitors must be located very close to the device.

The STPM01 contains a power on reset (POR) detection circuit. If the VCC supply is less

than 2.5 V then the STPM01 goes into an inactive state, all the functions are blocked

asserting a reset condition. This is useful to ensure correct device operation at power-up

and during power-down. The power supply monitor has built-in hysteresis and filtering,

which give a high degree of immunity to false triggering due to noisy supplies.

A bandgap voltage reference (VBG) of 1.23 V ±1 % is used as reference voltage level

source for the two linear regulators and for the A/D converters. Also, this module produces

several bias currents and voltages for all other analog modules and for the OTP module. The

bandgap voltage can be compensated regardless to the temperature variations with the

BGTC bits.

8.8

Load monitoring

The STPM01 includes a no load condition detection circuit with adjustable threshold. This

circuit monitors the voltage and the current channels and, when the measured voltage is

below the set threshold, the internal signal BIL becomes high. The information about this

signal is also available in the status bit BIL.

The no load condition occurs when the product between VRMS and IRMS register values is

below a given value. This value can be set with the LTCH configuration bits.

Four different no-load threshold values can be chosen according to the two configuration

bits LTCH (see Table 11).

Figure 17.

Bandgap temperature variation

Table 11.

No load detection thresholds

LTCH

KLTCH

0800

1600

3200

6400

STPM01 数据表(PDF) 23 Page - STMicroelectronics

STPM01 数据表(HTML) 23 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

数据表下载