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PDF STMPE812 Data sheet ( Hoja de datos )
| Número de pieza | STMPE812 | |
| Descripción | Enhanced 4-wire resistive touchscreen controller | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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STMPE812
Enhanced 4-wire resistive touchscreen controller with PWM
Preliminary data
Features
■ 4 GPIOs (8 mA drive, 12 mA sink at 3.3 V)
■ 1 additional, general purpose 12-bit ADC
■ Operating voltage 1.65 - 3.6 V
■ Integrated 4-wire touchscreen controller, pen-
down/real-time mode, fully-autonomous
■ 1 PWM controller
■ Auto-hibernation and low power
– Typ 0.5 µA in Hibernation mode
– Typ 100 µA in Active mode
■ Interrupt output pin (optional)
■ Reset input pin (optional)
■ Wake-up feature on each port configured as
GPIO input
■ I2C interface
■ 8 kV HBM, 1 kV CDM ESD protection on
X+/X-/Y+/Y-
■ 2 kV HBM, 250 V CDM ESD protection on all
other pins
Flip-chip 12
(2.17 x 1.67 mm)
Description
The STMPE812 is a 4-wire resistive touchscreen
controller with 4-bit port expander integrated.
The touchscreen controller is designed to be fully
autonomous, requiring only minimal CPU
intervention for sampling, filtering and pre-
processing operations.
Applications
■ Portable media players
■ Game consoles
■ Mobile and smart phones
Table 1. Device summary
Order code
STMPE812BJR
Package
Flip-chip 12 (2.17 x 1.67 mm)
Packaging
Tape and reel
July 2010
Doc ID 17732 Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
1/49
www.st.com
49
1 page  
STMPE812
1.1 Pin configuration and functions
Figure 2. Pin configuration (top through view)
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STMPE812 functional overview
X+ Y+ X- Y-
(A3) (B3) (C3) (D3)
VCC
P0
P1 GND
(A2) (B2) (C2) (D2)
P2
P3
SDA
SCL
(A1) (B1) (C1) (D1)
Table 2.
Pin
B3
C3
D3
C2
D2
D1
C1
B1
A1
!-6
Pin assignments
Name
Current capacity
Function
Y+ 50 mA current limit Y+
X-
Y-
P1
GND
SCL
SDA
P3
50 mA current limit X-
50 mA current limit Y-
+8 mA/-12 mA at GPIO-0 / ADC / PWM1 (3.6 V tolerant within VCC
3.3 V
valid range)
Can be > 80 mA
load at touchscreen Ground
and GPIO drive
-4 mA
-4 mA
I2C clock (fail safe, tolerant to 3.6 V regardless of
VCC)
I2C data (fail safe, tolerant to 3.6 V regardless of
VCC)
+8 mA/-12 mA at GPIO-3 / INT (3.6 V tolerant within VCC valid
3.3 V
range)
P2
+8 mA/-12 mA at GPIO-2 / RESET (3.6 V tolerant within VCC valid
3.3 V
range)
Doc ID 17732 Rev 1
5/49
5 Page 
STMPE812
3 Power supply
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Power supply
The STMPE812 GPIO operates from a supply pin VCC. For better resolution and noise
immunity, VCC above 2.8 V is recommended.
Power up reset
The STMPE812 is equipped with an internal POR circuit that holds the device in reset state,
until the VCC supply input is valid. The internal POR is tied to the VCC supply pin.
Doc ID 17732 Rev 1
11/49
11 Page | ||
| Páginas | Total 49 Páginas | |
| PDF Descargar | [ Datasheet STMPE812.PDF ] | |
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