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參數(shù)資料
| 型號： | TSC2200IRHB |
| 英文描述： | PDA ANALOG INTERFACE CIRCUIT |
| 中文描述： | 掌上電腦模擬接口電路 |
| 文件頁數(shù)： | 12/40頁 |
| 文件大?。?/td> | 645K |
| 代理商： | TSC2200IRHB |
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TSC2200
SBAS191F
MSB
BIT 15
LSB
BIT 0
BIT 14
BIT 13
BIT 12
BIT 11
BIT 10
BIT 9
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
R/W
PG3
PG2
PG1
PG0
ADDR5
ADDR4
ADDR3
ADDR2
ADDR1
ADDR0
X
X
X
X
X
TABLE I. TSC2200 Command Word.
PG3
PG2
PG1
PG0
PAGE ADDRESSED
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
Reserved
TABLE II. Page Addressing.
pulled to ground through the touch screen and
PENIRQ
output goes LOW due to the current path through the panel
to GND, initiating an interrupt to the processor. During the
measurement cycles for the X- and Y-positions, the X+ input
will be disconnected from the
PENIRQ
pull-down transistor to
eliminate any leakage current from the pull-up resistor to flow
through the touch screen, thus causing no errors.
In modes where the TSC2200 needs to detect if the screen
is still touched (for example, when doing a
PENIRQ
-initiated
X, Y, and Z conversion), the TSC2200 must reset the drivers
so that the 50k
resistor is connected again. Due to the high
value of this pull-up resistor, any capacitance on the touch
screen inputs will cause a long delay time, and may prevent
the detection from occurring correctly. To prevent this, the
TSC2200 has a circuit that allows any screen capacitance to
be
“
precharged
”
, so that the pull-up resistor does not have to
be the only source for the charging current. The time allowed
for this precharge, as well as the time needed to sense if the
screen is still touched, can be set in the Configuration Control
register.
This illustrates the need to use the minimum capacitor values
possible on the touch screen inputs. These capacitors may
be needed to reduce noise, but too large a value will increase
the needed precharge and sense times, as well as panel
voltage stabilization time.
DIGITAL INTERFACE
The TSC2200 communicates through a standard SPI bus.
The SPI allows full-duplex, synchronous, serial communica-
tion between a host processor (the master) and peripheral
devices (slaves). The SPI master generates the synchroniz-
ing clock and initiates transmissions. The SPI slave devices
depend on a master to start and synchronize transmissions.
A transmission begins when initiated by a master SPI. The
byte from the master SPI begins shifting in on the slave
MOSI pin under the control of the master serial clock. As the
byte shifts in on the MOSI pin, a byte shifts out on the MISO
pin to the master shift register.
The idle state of the serial clock for the TSC2200 is LOW,
which corresponds to a clock polarity setting of 0 (typical
microprocessor SPI control bit CPOL = 0). The TSC2200
interface is designed so that with a clock phase bit setting of
1 (typical microprocessor SPI control bit CPHA = 1), the
master begins driving its MOSI pin and the slave begins
driving its MISO pin on the first serial clock edge. The
SS
pin
should idle HIGH between transmissions. The TSC2200 will
only interpret command words that are transmitted after the
falling edge of
SS
.
TSC2200 COMMUNICATION PROTOCOL
The TSC2200 is entirely controlled by registers. Reading and
writing these registers is accomplished by the use of a 16-bit
command, which is sent prior to the data for that register. The
command is constructed as shown in Table I.
The command word begins with an
R/W
bit, which specifies
the direction of data flow on the serial bus. The following four
bits specify the page of memory this command is directed to,
as shown in Table II. The next six bits specify the register
address on that page of memory to which the data is
directed. The last five bits are reserved for future use.
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| TSC2200IRHBG4 | 功能描述:觸摸屏轉換器和控制器 Prog 4-Wire w/12-Bit 125KHz ADC & Key Ifc RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
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