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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： | 8/33页 |
| 文件大小： | 774K |
| 代理商： | TSC2046IRGVT |
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TSC2046
SBAS265G OCTOBER 2002 REVISED JANUARY 2008
www.ti.com
16
If
X-Position,
Y-Position,
and
Pressure-Touch
are
measured in the single-ended mode, an external reference
voltage is needed. The TSC2046 must also be powered
from the external reference. Caution should be observed
when using the single-ended mode such that the input
voltage to the ADC does not exceed the internal reference
voltage, especially if the supply voltage is greater than
2.7V.
NOTE: The differential mode can only be used for
X-Position,
Y-Position,
and
Pressure-Touch
measurements. All other measurements require the
single-ended mode.
PD0 and PD1—Table 5 describes the power-down and
the internal reference voltage configurations. The internal
reference voltage can be turned on or off independently of
the ADC. This can allow extra time for the internal
reference voltage to settle to the final value prior to making
a conversion. Make sure to also allow this extra wake-up
time if the internal reference is powered down. The ADC
requires no wake-up time and can be instantaneously
used. Also note that the status of the internal reference
power-down is latched into the part (internally) with BUSY
going high. In order to turn the reference off, an additional
write to the TSC2046 is required after the channel has
been converted.
PD1
PD0
PENIRQ
DESCRIPTION
0
Enabled
Power-Down Between Conversions. When
each conversion is finished, the converter
enters a low-power mode. At the start of the
next conversion, the device instantly powers up
to full power. There is no need for additional
delays to ensure full operation, and the very first
conversion is valid. The Y switch is on when in
power-down.
0
1
Disabled
Reference is off and ADC is on.
1
0
Enabled
Reference is on and ADC is off.
1
Disabled
Device is always powered. Reference is on and
ADC is on.
Table 5. Power-Down and Internal Reference
Selection
PENIRQ OUTPUT
The pen-interrupt output function is shown in Figure 10.
While in power-down mode with PD0 = 0, the Y-driver is on
and connects the Y-plane of the touch screen to GND. The
PENIRQ output is connected to the X+ input through two
transmission gates. When the screen is touched, the X+
input is pulled to ground through the touch screen.
In most of the TSC2046 models, the internal pullup resistor
value is nominally 50k
, but this may vary between 36k
and 67k
given process and temperature variations. In order
to assure a logic low of 0.35
S (+VCC) is presented to the
PENIRQ circuitry, the total resistance between the X+ and
Y terminals must be less than 21k
.
PENIRQ
+V
CC
50k
or
90k
On
Y+ or X+ drivers on,
or TEMP0, TEMP1
measurements activated.
Y+
X+
Y
TEMP0
TEMP1
TEMP
DIODE
High except
when TEMP0,
TEMP1 activated.
+V
CC
Level
Shifter
IOVDD
Figure 10. PENIRQ Functional Block Diagram
The 90 version of the TSC2046 uses a nominal 90k
pullup resistor, which allows the total resistance between
the X+ and Y terminals to be as high as 30k
. Note that
the higher pullup resistance will cause a slower response
time of the PENIRQ to a screen touch, so user software
should take this into account.
The PENIRQ output goes low due to the current path through
the touch screen to ground, which initiates an interrupt to the
processor. During the measurement cycle for X-, Y-, and
Z-Position, the X+ input is disconnected from the PENIRQ
internal pull-up resistor. This is done to eliminate any leakage
current from the internal pull-up resistor through the touch
screen, thus causing no errors.
Furthermore, the PENIRQ output is disabled and low during
the measurement cycle for X-, Y-, and Z-Position. The
PENIRQ
output
is
disabled
and
high
during
the
measurement cycle for battery monitor, auxiliary input, and
chip temperature. If the last control byte written to the
TSC2046 contains PD0 = 1, the pen-interrupt output function
is disabled and is not able to detect when the screen is
touched. In order to re-enable the pen-interrupt output
function under these circumstances, a control byte needs to
be written to the TSC2046 with PD0 = 0. If the last control
byte written to the TSC2046 contains PD0 = 0, the
pen-interrupt output function is enabled at the end of the
conversion. The end of the conversion occurs on the falling
edge of DCLK after bit 1 of the converted data is clocked out
of the TSC2046.
It is recommended that the processor mask the interrupt
PENIRQ is associated with whenever the processor sends
a control byte to the TSC2046. This prevents false triggering
of interrupts when the PENIRQ output is disabled in the
cases discussed in this section.
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