BLUENRG-2 datasheet(34/190 Pages) STMICROELECTRONICS

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Functional details

BlueNRG-2

34/190

DocID030675 Rev 2

3.6.2.3

ADC conversion

The relationship between differential input voltage and ADCRAW code (first 16-bit MSB of

ADC_CONV register) depends on a limited set of parameters: the digital reference voltage

VREF, the PGA value, and a scaling factor.

Differential mode

��12(��) = ��1 − ��2 = (1 + ��) ∗ (

��

��_16(��)

) ∗ ��

With:



PGASEL is the input attenuation register, values: 0, 1 or 2.



ADCRAW is the value ADC_CONV[31:16].



FS_16(OSR) is the full scale factor for ADCRAW it depends on the oversampling ratio

(OSR):



FS_16(32) = FS_16(64) = 35442



FS_16(100) = FS_16(200) = 41260



VREF represents the digital core power supply, equals to 2*VDD1V2 = 2.4.

Single ended mode

��1(��) = (1 + ��) ∗ (�� + (

��

��_16(��)

) ∗ ��

��2(��) = (1 + ��) ∗ (�� − (

��

��_16(��)

) ∗ ��

With:



PGASEL is the input attenuation register, values: 0, 1 or 2.



ADCRAW is the value ADC_CONV[31:16].



FS_16(OSR) is the full scale factor for ADCRAW it depends on the oversampling ratio

(OSR):



FS_16(32) = FS_16(64) = 35442



FS_16(100) = FS_16(200) = 41260



VREF represents the digital core power supply, equals to 2*VDD1V2 = 2.4.



Vbias is given by the register REFSEL, value 0.6 V or 1.2 V.

Battery level detector

��(��) = �� ∗ (�� − (

��

��_16(��)

) ∗ ��)

This mode enables the monitoring of the battery voltage VBATT, through an internal resistive

bridge.

With:



ADCRAW is the value ADC_CONV[31:16].



FS_16(OSR) is the full scale factor for ADCRAW it depends on the oversampling ratio

(OSR):



FS_16(32) = FS_16(64) = 35442



FS_16(100) = FS_16(200) = 41260



VREF represents the digital core power supply, equals to 2*VDD1V2 = 2.4.



Vbias is 0.6 V.



KBATT is 4.36.

Temperature sensor

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