L9966 datasheet(49/122 Pages) STMICROELECTRONICS

49 / 122 page

Voltage dividers and internal signals

The device implements different voltage dividers to scale the system voltage rails (UBSW, VI5V, VIX) to a suitable

level for the integrated ADC1.

The full range of the ADC1 is 1.25V

In Table 29 the voltage divider ratios parameters are listed. The chosen voltage divider is set simply based on

the voltage pin being converted, regardless of the configuration of PUP_DIV[1:0] in SC_CONF or SQNCR_CMDx

registers.

Table 29. Voltage dividers and internal signals electrical parameters

Symbol

Parameter

Condition

Min

Typ

Max

Unit

UBSW = 7.5 V:36 V, VDD5V = 4.85 V:5.15 V, Tj-max = 150 °C unless otherwise specified.

RatioBatt

Voltage divider ratio to ADC1

UBSW input range 40 V

95%FR=39.22+-3.5%

-3.5%

+3.5% V/V

UBSW

RatioIX

Voltage divider ratio to ADC1

VIX input range 25 V

95%FR=24.95 V

-3%

+3%

V/V

VIX

RatioT5V

Voltage divider ratio to ADC1

VI5V input range 5 V

95%FR=4.87 V

-3%

4.1

+3%

V/V

VI5V

RatioBG

Voltage divider ratio to ADC1

Bandgap reference ratio Design info

-3%

1.975

+3%

V/V

ADC1err_UBSW ADC1 total measurement error

Including all error contributions (VDD5REF

excl.) UBSW input range 42 V

(1LSB=10 mV)

144

LSB

UBSW

ADC1err_VIX

ADC1 total measurement error

Including all error contributions (VDD5REF

excl.) VIX input range 27 V (1LSB=7 mV)

110

LSB

VIX

VIX_range

VIX input range

0.75

VIX

ADC1err_VI5V

ADC1 total measurement error

Including all error contributions (VDD5REF

excl.) VI5V input range 5.15 V

(1LSB=1.3 mV)

LSB

VI5V

VI5V_range

VI5V input range

0.15

VI5V

ADC1err_BG

ADC1 total measurement error

Including all error contributions (VDD5REF

excl.) (1LSB=0.3 mV)

100

LSB

RatioX

Voltage divider to VIX and VTX

VIX/VTX ratio

-2%

5.85

+2%

V/V

VIX, VTX

Ratio5V

Voltage divider to VT5V and

VT5V

VI5V/VT5V ratio

-1%

1.04

+1%

V/V VI5V, VT5V

VT5V output

Divider output impedance

-50%

48k

+50%

Ω

VT5V

VTX output

Divider output impedance

-45%

58k

+45%

Ω

VTX

VI5V input

Divider input impedance

-50%

97k

+50%

Ω

VI5V

VIX input

Divider input impedance

-45% 135k +45%

Ω

VIX

V therm

Thermal sensor voltage

Design info (-40 °C)

0.5

V therm

Thermal sensor voltage

Design info (27 °C)

0.65

V therm

Thermal sensor voltage

Design info (150 °C)

0.89

To save power consumption, the voltage dividers are switched off when the device enters SLEEP or

RST_ACTIVE mode.

When the conversion is requested on UBSW, VI5V, VIX or VBG the proper voltage divider is automatically

applied. In case the internal bandgap voltage reference is to be converted, no voltage divider is used.

L9966

Voltage dividers and internal signals

DS12459 - Rev 10

page 49/122

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