STM32F101C4T6ATR 데이터 시트보기 (PDF) - STMicroelectronics

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STM32F101C4T6ATR

Low-density access line, ARM-based 32-bit MCU with 16 or 32 KB Flash, 5 timers, ADC and 4 communication interfaces

STMicroelectronics 

STM32F101x4, STM32F101x6

Electrical characteristics

Equation 1: RAIN max formula:

RAIN

<

----------------------------T----S-----------------------------

fADC × CADC × ln (2N + 2)

–

RADC

The formula above (Equation 1) is used to determine the maximum external impedance allowed for an

error below 1/4 of LSB. Here N = 12 (from 12-bit resolution).

Table 43. RAIN max for fADC = 14 MHz(1)

Ts (cycles)

tS (µs)

1.5

0.11

7.5

0.54

13.5

0.96

28.5

2.04

41.5

2.96

55.5

3.96

71.5

5.11

239.5

17.1

1. Guaranteed by design, not tested in production.

0.4

5.9

11.4

25.2

37.2

50

NA

NA

RAIN max (kΩ)

Table 44.

Symbol

ADC accuracy - limited test conditions(1) (2)

Parameter

Test conditions

Typ Max(3) Unit

ET Total unadjusted error

EO Offset error

EG Gain error

ED Differential linearity error

EL Integral linearity error

fPCLK2 = 28 MHz,

fADC = 14 MHz, RAIN < 10 kΩ,

VDDA = 3 V to 3.6 V

TA = 25 °C

Measurements made after

ADC calibration

±1.3

±1

±0.5

±0.7

±0.8

±2

±1.5

±1.5 LSB

±1

±1.5

1. ADC DC accuracy values are measured after internal calibration.

2. ADC Accuracy vs. Negative Injection Current: Injecting negative current on any of the standard (non-

robust) analog input pins should be avoided as this significantly reduces the accuracy of the conversion

being performed on another analog input. It is recommended to add a Schottky diode (pin to ground) to

standard analog pins which may potentially inject negative current.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 5.3.12 does not

affect the ADC accuracy.

3. Based on characterization, not tested in production.

Doc ID 15058 Rev 5

65/79

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