Motor de Búsqueda de Datasheet de Componentes Electrónicos
  Spanish  ▼
ALLDATASHEET.ES

X  

AN2687 Datasheet(PDF) 13 Page - STMicroelectronics

No. de pieza AN2687
Descripción Electrónicos  STM8S20xxx LCD software driver
Download  22 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2687 Datasheet(HTML) 13 Page - STMicroelectronics

Back Button AN2687 Datasheet HTML 9Page - STMicroelectronics AN2687 Datasheet HTML 10Page - STMicroelectronics AN2687 Datasheet HTML 11Page - STMicroelectronics AN2687 Datasheet HTML 12Page - STMicroelectronics AN2687 Datasheet HTML 13Page - STMicroelectronics AN2687 Datasheet HTML 14Page - STMicroelectronics AN2687 Datasheet HTML 15Page - STMicroelectronics AN2687 Datasheet HTML 16Page - STMicroelectronics AN2687 Datasheet HTML 17Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 13 / 22 page
background image
AN2687
Example of a quadruplex LCD driver with STM8
Doc ID 14296 Rev 1
13/22
same interrupt function) and 2 Overflow events (OVF) in each phase. The latter are
described below:
During CCR1_1, VDD is applied to the segments that have to be turned on and 0, to the
segments that have to be turned off. The COM line that corresponds to this phase is set
to low level. Other COM lines are set to the VDD/2 level.
During OVF1, all COM lines are inactive (set to low level), then if Vrms has to be
decreased (see Figure 6) all segments are set low or, if it has to be increased (see
Figure 7), all segments are set high.
During CCR1_2, the segment lines are supplied with voltage levels that are inverted
compared to those applied during CCR1_1. The COM line that corresponds to this
phase is set to high level. Other COM lines are set to the VDD/2 level.
During OVF2, if Vrms has to be decreased then all COM lines and segments are
inactive (set to low level) and if Vrms has to be increased (see Figure 7), the COM lines
are set high and the segments are set low.
In order to reduce consumption, the MCU is placed in WFI (wait for interrupt) mode in the
main routine. The MCU is then woken up by the Timer 2 interrupts and the external
interrupts (PA4/PA5 connected to push-buttons, refer to Section 6 for more information).
3.2
Second method: Auto-wakeup
In this method, the LCD timing is generated by the Auto-wakeup time base. The MCU is
placed in Auto-wakeup mode, meaning that it is in Halt mode but woken up periodically as
the LSI source clock (embedded low-power RC around 128 kHz) remains active. When
woken up, the MCU toggles the COM and SEG lines in the AWU interrupt routine, exactly as
it was doing in the previous method in the Timer 2 interrupt routine.
The software contrast control is not as easy to implement with this method as AWU timeouts
are fixed. It could be less fine-tuned.
Using this method, consumption can be very low (a total consumption of 1.08 mA at 3.3 V
with HSI as the master clock).


Número de pieza similar - AN2687

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
STMicroelectronics
AN2680 STMICROELECTRONICS-AN2680 Datasheet
131Kb / 15P
   Fan speed controller based on STDS75 or STLM75 digital
AN2682 STMICROELECTRONICS-AN2682 Datasheet
164Kb / 15P
   This application note describes how to interface
AN2683 STMICROELECTRONICS-AN2683 Datasheet
598Kb / 38P
   Compact dual output point of load converter
AN2684 STMICROELECTRONICS-AN2684 Datasheet
769Kb / 21P
   The STEVAL-IFP006V1 demonstration board has been developed
AN2686 STMICROELECTRONICS-AN2686 Datasheet
525Kb / 11P
   Using the STVM100 to fully auto adjust LCD flicker
More results

Descripción similar - AN2687

Fabricante ElectrónicoNo. de piezaDatasheetDescripción Electrónicos
logo
STMicroelectronics
AN1048 STMICROELECTRONICS-AN1048 Datasheet
231Kb / 21P
   ST7 software LCD driver
logo
NXP Semiconductors
OL2385SWUG NXP-OL2385SWUG Datasheet
10Mb / 64P
   SIGFOX software driver
Rev. 2.1-6 April 2018
logo
STMicroelectronics
AN1447 STMICROELECTRONICS-AN1447 Datasheet
208Kb / 26P
   SOFTWARE DRIVER FOR 4-MULTIPLEXED LCD WITH A STANDARD ST62
UM1620 STMICROELECTRONICS-UM1620 Datasheet
1,015Kb / 41P
   Standard software driver for C90FL
UM0563 STMICROELECTRONICS-UM0563 Datasheet
536Kb / 46P
   L9952GXP software driver user manual
UM1627 STMICROELECTRONICS-UM1627 Datasheet
955Kb / 38P
   Standard software driver for C90LC Flash
UM1634 STMICROELECTRONICS-UM1634 Datasheet
1Mb / 43P
   Standard software driver for C90FL2 Flash
logo
Sony Corporation
CXA7000R SONY-CXA7000R Datasheet
278Kb / 23P
   LCD Driver
logo
Neotec Semiconductor Lt...
NT7107C NEOTEC-NT7107C Datasheet
547Kb / 21P
   LCD driver
Rev1.0 2015/08/17
NT7108C NEOTEC-NT7108C Datasheet
596Kb / 25P
   LCD driver
Rev1.0 2015/08/17
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22


Datasheet Descarga

Go To PDF Page


Enlace URL




Política de Privacidad
ALLDATASHEET.ES
¿ALLDATASHEET es útil para Ud.?  [ DONATE ] 

Todo acerca de Alldatasheet   |   Publicidad   |   Contáctenos   |   Política de Privacidad   |   Intercambio de Enlaces   |   Lista de Fabricantes
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com