STPM32 datasheet(20/89 Pages) STMICROELECTRONICS

20 / 89 page

To disable a single voltage or current channel, enV1, enC1 bits for primary channel and enV2, enC2 for

secondary channel should be cleared in DFE_CR1 and DFE_CR2 respectively. Switching off some channels

allows an operating current reduction as reported in Table 4

As described in Figure 22, two EN_REF1 and EN_REF2 bits enable the voltage references; if a unique voltage

reference is used, one of these two bits must be disabled and VREF1 and VREF2 pins must be shorted; if an

external reference is used both bits must be disabled and the external reference must be connected to VREF1,

VREF2 pins. VREF1 and VREF2 outputs should be connected to GNDREF via a 100 nF capacitor independently.

Figure 22. Power management internal connection scheme and polarization

VCC

VDDA

GNDA

LDR 3.0V

VOLTAGE

REFERENCE

VRefC1

VRefV1

TC2

VDDD

VOLTAGE

REFERENCE

TC1

LDR 1.2V

GNDD

GNDREF

VRefC2

VRefV2

1uF

100nF

1uF

100nF

100

3.3V

GND_REG

VREF1

VREF2

VREF1_EN

VREF2_EN

Temperature compensated reference voltage generators produce VREF1 = VREF2 = 1.18 V at default settings.

The primary voltage reference is always on and supplies the voltage and the primary current channel, the

secondary voltage reference is by default in on-state and supplies the secondary channel.

These reference temperature compensation curves can be selected through three configuration bits: TCx[2:0]

(DSP_CR1 and DSP_CR2).

Table 8. Temperature compensation selection

TCx0

TCx1

TCx2

TC_VREF (ppm/°C)

-30

30 (default)

120

150

180

STPM32, STPM33, STPM34

Functional description of the analog part

DS10272 - Rev 13

page 20/89

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