STM32L100RB datasheet(85/103 Pages) STMICROELECTRONICS

85 / 103 page

DocID024295 Rev 5

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STM32L100C6 STM32L100R8/RB

Electrical characteristics

Figure 24. Maximum dynamic current consumption on VDDA supply pin during ADC

conversion

General PCB design guidelines

Power supply decoupling should be performed as shown in Figure 8, depending on whether

VREF+ is connected to VDDA or not. The 100 nF capacitors should be ceramic (good quality).

They should be placed as close as possible to the chip.

ADC clock

Sampling (n cycles)

Conversion (12 cycles)

IDDA

1300 µA

1700 µA

MS36686V1

Table 55. Maximum source impedance RAIN max(1)

(µs)

RAIN max (kOhm)

Ts (cycles)

fADC= 16 MHz(2)

Multiplexed channels

Direct channels

2.4 V < VDDA< 3.6 V 1.8 V < VDDA < 2.4 V 2.4 V < VDDA< 3.3 V 1.8 V < VDDA < 2.4 V

0.25

Not allowed

0.7

Not allowed

0.5625

0.8

Not allowed

2.0

1.0

2.0

0.8

4.0

3.0

1.5

3.0

1.8

6.0

4.5

6.8

4.0

15.0

10.0

15.0

10.0

30.0

20.0

32.0

25.0

50.0

40.0

192

50.0

384

1. Guaranteed by design.

2. Number of samples calculated for fADC = 16 MHz. For fADC = 8 and 4 MHz the number of sampling cycles can be

reduced with respect to the minimum sampling time Ts (us).

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