BLUENRG-2 datasheet(35/190 Pages) STMICROELECTRONICS

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BlueNRG-2

Functional details

DocID030675 Rev 2

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This mode enables the monitoring of the temperature by means of an internal sensor, with

the following voltage to temperature conversion:

��(°��) = �� ∗ (�� − (

��

��_16(��)

) ∗ ��) + ��

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.



KTC is 401



OFFSETTC is -267 °C

To ensure an accurate temperature reading, average the value over several reads.

3.6.3

ADC registers

ADC peripheral base address (ADC_BASE_ADDR) 0x40800000.

Table 31: ADC registers

Address

offset

Name

Reset

Description

0x00

CTRL

0x00000000

ADC control register. Refer to the detailed

description below.

0x04

CONF

0x0000000C

ADC configuration register. Refer to the

detailed description below.

0x08

IRQSTAT

0x00000000

IRQ masked status register. Refer to the

detailed description below.

0x0C

IRQMASK

0x0000000F

It sets the mask for ADC interrupt. Refer to

the detailed description below.

0x14

DATA_CONV

0x00000000

Result of the conversion in two

complement format.

0x18

OFFSET

0x00000000

Offset for correction of converted data

0x20

SR_REG

0x00000000

ADC status register. Refer to the detailed

description below.

0x24

THRESHOLD_HI

0xFFFFFFFF

High threshold for window comparator

0x28

THRESHOLD_LO

0x00000000

Low threshold for window comparator

Table 32: ADC - CTRL register description: address offset ADC_BASE_ADDR+0x00

Bit

Field name

Reset

Description

0x0

Starts ADC analog subsystem. This bit must be set before

starting a conversion.

0: ADC is OFF.

1: ADC is ON.

CALEN

0x0

Enables the calibration phase when set to 1. This bit is

cleared and the calibration is disabled by setting the

RSTCALEN bit.

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