STM32L100R8-A datasheet(24/103 Pages) STMICROELECTRONICS

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Functional overview

STM32L100x6/8/B-A

24/103

DocID025966 Rev 6

3.9

LCD (liquid crystal display)

The LCD drives up to 8 common terminals and 32 segment terminals to drive up to 224

pixels.

•

Internal step-up converter to guarantee functionality and contrast control irrespective of

VDD. This converter can be deactivated, in which case the VLCD pin is used to provide

the voltage to the LCD

•

Supports static, 1/2, 1/3, 1/4 and 1/8 duty

•

Supports static, 1/2, 1/3 and 1/4 bias

•

Phase inversion to reduce power consumption and EMI

•

Up to 8 pixels can be programmed to blink

•

Unneeded segments and common pins can be used as general I/O pins

•

LCD RAM can be updated at any time owing to a double-buffer

•

The LCD controller can operate in Stop mode

•

VLCD rail decoupling capability

3.10

ADC (analog-to-digital converter)

A 12-bit analog-to-digital converters is embedded into STM32L100x6/8/B-A devices with up

to 20 external channels, performing conversions in single-shot or scan mode. In scan mode,

automatic conversion is performed on a selected group of analog inputs.

The ADC can be served by the DMA controller.

An analog watchdog feature allows very precise monitoring of the converted voltage of one,

some or all selected channels. An interrupt is generated when the converted voltage is

outside the programmed thresholds.

The events generated by the general-purpose timers (TIMx) can be internally connected to

the ADC start trigger and injection trigger, to allow the application to synchronize A/D

conversions and timers. An injection mode allows high priority conversions to be done by

interrupting a scan mode which runs in as a background task.

The ADC includes a specific low-power mode. The converter is able to operate at maximum

speed even if the CPU is operating at a very low frequency and has an auto-shutdown

function. The ADC’s runtime and analog front-end current consumption are thus minimized

whatever the MCU operating mode.

3.10.1

Internal voltage reference (VREFINT)

The internal voltage reference (VREFINT) provides a stable (bandgap) voltage output for the

ADC and Comparators. VREFINT is internally connected to the ADC_IN17 input channel. It

Table 6. VLCD rail decoupling

Bias

1/2

1/3

1/4

VLCDrail1

1/2 VLCD

2/3 VLCD

1/2 VLCD

PB2

VLCDrail2

1/3 VLCD

1/4 VLCD

PB12

VLCDrail3

3/4 VLCD

PB0

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