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PDF BL2046 Data sheet ( Hoja de datos )
| Número de pieza | BL2046 | |
| Descripción | Low Voltage I/O TOUCH SCREEN CONTROLLER | |
| Fabricantes | BELLING | |
| Logotipo |  |
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BL2046
Low Voltage I/O TOUCH SCREEN CONTROLLER
Features
2.2V to 5.25V operation
1.5V to 5.25V digital I/O
Internal 2.5V reference
4-wire I/F
Programmable 8 or 12 bit Resolution
Direct battery measurement(0V to 6V)
Temperature measurement
Touch-pressure measurement
Available in QFN-16 and TSSOP-16 package
General Description
The BL2046 is a 4-wire touch screen controller which supports a low-voltage I/O interface from
1.5V to 5.25V. The BL2046 has an on-chip 2.5V reference that can be used for the auxiliary input,
battery monitor, and temperature measurement modes. The reference can also be powered down
when not used to conserve power. The internal reference operates down to 2.7V supply voltage,
while monitoring the battery voltage from 0V to 6V.
The BL2046 is a highly integrated controller for portable applications with 4-wire resistive touch
panel such as, PDA, portable instruments, cellular phone, etc.
Applications
Cellular phones
Personal digital assistants
Touch screen monitors
Portable instruments
Order Information
Part Number
BL2046QN
BL2046TS
Package
QFN-16
TSSOP-16
Shipping
3000pcs / Tape & Reel
2500pcs / Tape & Reel
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Total 1 Pages
1 page  
BL2046
Internal Reference On
250 Ω
DIGITAL INPUTfOUTPUT
Logic Family
VIH
VIL
VOH
VOL
Data Format
I +5uA
I +5uA
LOH = -250 uA
LOL = 250uA
POWER-SUPPLY
REQUIREMENTS
+VCC5
IOVDO6
Quiescent Current7
Specified Performance
Operating Range
Internal Reference Off
Internal Reference On
fSAMPLE= 12.5kHz
Power-Down Mode with
IOVD ·0.7
-0.3
IOVDD·0.8
CMOS
Straight
Binary
IOVDD+0.3
0.3 • IOVDD
0.4
2.7
2.2
1.5
280
780
220
3.6
5.25
+VCC
650
3
V
V
V
V
V
V
V
uA
uA
uA
uA
Power Dissipation
TEMPERATURE RANGE
Specified Performance
SWITCH DRIVERS
Qn-Resistance
Y+, X+
Y-.X-
Drive Current2
+VCC=+2.7V
Duration 100ms
-4
5
6
1.8 mW
+85
Ω
Ω
50 mA
NOTES: (1) LSB means least significant bit. With VREF = +2.5V, one LSB is 610µV. (2) Assured by design, but
not tested. Exceeding 50mA source current may result in device degradation. (3) Difference between TEMP0 and
TEMP1 measurement, no calibration necessary. (4) Temperature drift is –2.1mV/°C. (5) BL2046 operates down to
2.2V. (6) IOVDD must be - +VCC. (7) Combined supply current from +VCC and IOVDD. Typical values obtained
from conversions on AUX input with PD0 = 0.
Analog Input
Table 1 and Table 2 show the relationship between the A2, A1, A0, and SER/
control bits
and the configuration of the BL2046. The control bits are provided serially via the DIN pin (see
the Digital Interface section of this data sheet for more details).
When the converter enters the hold mode, the voltage difference between the +IN and –IN inputs
is captured on the internal capacitor array. The input current into the analog inputs depends on the
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BL2046
performing this measurement. The BL2046 supports two methods. The first method requires
knowing the X-plate resistance, measurement of the X-Position, and two additional cross panel
measurements (Z1 and Z2) of the touch screen, as shown in Figure 6. Using Equation 2 calculates
the touch resistance:
The second method requires knowing both the X-plate and Y-plate resistance, measurement of
X-Position and Y-Position, and Z1. Using Equation 3 also calculates the touch resistance:
Figure 6. Pressure Measurement Block Diagrams.
Digital Interface
Figure 7 shows the typical operation of the BL2046 digital interface. This diagram assumes that
the source of the digital signals is a microcontroller or digital signal processor with a basic serial
interface. Each communication between the processor and the converter, such as SPI or SSI
synchronous serial interface, consists of eight clock cycles. One complete conversion can be
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Total 11 Pages
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet BL2046.PDF ] | |
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