STM32W108CC STMicroelectronics, STM32W108CC Datasheet - Page 174

• Manufacturer Part Number: STM32W108CC
• Description: High-performance, IEEE 802.15.4 wireless system-on-chip with embedded Flash memory
• Manufacturer: STMicroelectronics

Specifications of STM32W108CC

• Receive Current (w/ Cpu): 27 mA
• Transmit Current (w/ Cpu, +3 Dbm Tx): 31 mA
• Low Deep Sleep Current, With Retained Ram And Gpio: 400 nA/800 nA with/without sleep timer
• Standard Arm Debug Capabilities: Flash patch & breakpoint; data watchpoint & trace; instrumentation trace macrocell
• Single Voltage Operation: 2.1-3.6 V with internal 1.8 V and 1.25 V regulators

Analog-to-digital converter
11.1.4
174/232
Offset/gain correction
When a conversion is complete, the 16-bit converted data is processed by offset/gain
correction logic:
●
●
●
ADC_GAIN is an unsigned scaled 16-bit value: ADC_GAIN[15] is the integer part of the gain
factor and ADC_GAIN[14:0] is the fractional part. As a result, ADC_GAIN values can
represent gain factors from 0 through (2 – 2
Reset initializes the offset to zero (ADC_OFFSET = 0) and gain factor to one (ADC_GAIN =
0x8000).
For the STM32W108CC and STM32108CZ devices, a software mechanism is used to
measure and cancel the HV buffer offset.
The HV offset calculation requires two measurements with respectively CHOP = 1 and
CHOP = 0.
The HV offset values is then calculated as follows:
where:
(HV_buf_out)
2
×
The basic ADC conversion result is added to the 16-bit signed (two’s complement)
value of the ADC offset register (ADC_OFFSET).
The offset-corrected data is multiplied by the 16-bit ADC gain register, ADC_GAIN, to
produce a 16-bit signed result. If the product is greater than 0x7FFF (32767), or less
than 0x8000 (-32768), it is limited to that value and the INT_ADCSAT bit is set in the
INT_ADCFLAG register.
The offset/gain corrected value is divided by two to produce the final result.
(
(
HV_buf_out
0 and
)
(HV_buf_out)
0
–
(
HV_buf_out
STM32W108HB STM32W108CC STM32W108CB STM32W108CZ
Doc ID 16252 Rev 13
1
are the outputs of the HV buffer (input of the ADC).
)
1
)
-15
).