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参数资料
| 型号： | TSC2046IRGVT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC16 |
| 封装： | 4 X 4 MM, 1MM HEIGHT, GREEN, PLASTIC, QFN-16 |
| 文件页数： | 7/33页 |
| 文件大小： | 774K |
| 代理商： | TSC2046IRGVT |
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TSC2046
SBAS265G OCTOBER 2002 REVISED JANUARY 2008
www.ti.com
15
Control Byte
The control byte (on DIN), as shown in Table 3, provides the
start conversion, addressing, ADC resolution, configuration,
and power-down of the TSC2046. Figure 9, Table 3 and
Table 4 give detailed information regarding the order and
description of these control bits within the control byte.
Initiate START—The first bit, the S bit, must always be
high and initiates the start of the control byte. The
TSC2046 ignores inputs on the DIN pin until the start bit is
detected.
Addressing—The next three bits (A2, A1, and A0) select
the active input channel(s) of the input multiplexer (see
Table 1, Table 2, and Figure 2), touch screen drivers, and
the reference inputs.
MODE—The mode bit sets the resolution of the ADC. With
this bit low, the next conversion has 12 bits of resolution,
whereas with this bit high, the next conversion has eight
bits of resolution.
SER/DFR—The SER/DFR bit controls the reference
mode, either single-ended (high) or differential (low). The
differential mode is also referred to as the ratiometric
conversion mode and is preferred for X-Position,
Y-Position,
and
Pressure-Touch
measurements
for
optimum performance. The reference is derived from the
voltage at the switch drivers, which is almost the same as
the voltage to the touch screen. In this case, a reference
voltage is not needed as the reference voltage to the ADC
is the voltage across the touch screen. In the single-ended
mode, the converter reference voltage is always the
difference between the VREF and GND pins (see Table 1
and Table 2, and Figure 2 through Figure 5, for further
information).
BIT 7
(MSB)
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
(LSB)
S
A2
A1
A0
MODE
SER/DFR
PD1
PD0
Table 3. Order of the Control Bits in the Control
Byte
BIT
NAME
DESCRIPTION
7
S
Start bit. Control byte starts with first high bit on DIN.
A new control byte can start every 15th clock cycle
in 12-bit conversion mode or every 11th clock cycle
in 8-bit conversion mode (see Figure 13).
6-4
A2-A0
Channel Select bits. Along with the SER/DFR bit,
these bits control the setting of the multiplexer input,
touch driver switches, and reference inputs (see
Table 1 and Figure 13).
3
MODE
12-Bit/8-Bit Conversion Select bit. This bit controls
the number of bits for the next conversion: 12-bits
(low) or 8-bits (high).
2
SER/DFR
Single-Ended/Differential Reference Select bit. Along
with bits A2-A0, this bit controls the setting of the
multiplexer input, touch driver switches, and
reference inputs (see Table 1 and Table 2).
1-0
PD1-PD0
Power-Down Mode Select bits. Refer to Table 5 for
details.
Table 4. Descriptions of the Control Bits within
the Control Byte
p
t
ACQ
Acquire
Idle
Conversion
Idle
1
DCLK
CS
81
11
DOUT
BUSY
Drivers 1 and 2
(1)
(SER/DFR High)
Drivers 1 and 2
(1, 2)
(SER/DFR Low)
(MSB)
(START)
(LSB)
A2
S
On
Off
DIN
A1
A0 MODE
SER/
DFR
PD1 PD0
10
987
65
4
3
2
1
0
Zero Filled...
81
8
(1) For YPosition, Driver 1 is on X+ is selected, and Driver 2 is off. For XPosition, Driver 1 is off, Y+ is selected, and Driver 2 is on. Y
will turn on
when powerdown mode is entered and PD0 = 0.
(2) Drivers will remain on if PD0 = 1 (no power down) until selected input channel, reference mode, or owerdown mode is changed, or CS is high.
NOTES:
Figure 9. Conversion Timing, 24 Clocks-per-Conversion, 8-Bit Bus Interface.
No DCLK delay required with dedicated serial port
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