STM32L151RCT6A datasheet(102/136 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L151xC STM32L152xC

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Doc ID 022799 Rev 3

Sampling time

Direct channels

2.4 V

≤ VDDA ≤ 3.6 V

0.25(5)

µs

Multiplexed channels

2.4 V

≤ VDDA ≤ 3.6 V

0.56(5)

Direct channels

1.8 V

≤ VDDA ≤ 2.4 V

0.56(5)

Multiplexed channels

1.8 V

≤ VDDA ≤ 2.4 V

1(5)

384

1/fADC

tCONV

Total conversion time

(including sampling time)

fADC = 16 MHz

24.75

µs

4 to 384 (sampling

phase) +12 (successive

approximation)

1/fADC

CADC

Internal sample and hold

capacitor

Direct channels

Multiplexed channels

fTRIG

External trigger frequency

Regular sequencer

12-bit conversions

Tconv+1 1/fADC

6/8/10-bit conversions

Tconv

1/fADC

fTRIG

External trigger frequency

Injected sequencer

12-bit conversions

Tconv+2 1/fADC

6/8/10-bit conversions

Tconv+1 1/fADC

RAIN

(6)

External input impedance

0.5

tlat

Injection trigger conversion

latency

fADC = 16 MHz

219

281

3.5

4.5

1/fADC

tlatr

Regular trigger conversion

latency

fADC = 16 MHz

156

219

2.5

3.5

1/fADC

tSTAB

Power-up time

3.5

µs

The Vref+ input can be grounded if neither the ADC nor the DAC are used (this allows to shut down an

external voltage reference).

The current consumption through VREF is composed of two parameters:

- one constant (max 300 µA)

- one variable (max 400 µA), only during sampling time + 2 first conversion pulses

So, peak consumption is 300+400 = 700 µA and average consumption is 300 + [(4 sampling + 2) /16] x

400 = 450 µA at 1Msps

VREF+ can be internally connected to VDDA and VREF- can be internally connected to VSSA, depending on

the package. Refer to Section 4: Pin descriptions for further details.

VSSA or VREF- must be tied to ground.

Minimum sampling and conversion time is reached for maximum Rext = 0.5 k

Ω.

For 1 Msps, maximum Rext is 0.5 k

Ω.

Table 55.

ADC characteristics (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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