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ADS7845EG4 Datasheet(PDF) 9 Page - Texas Instruments

Part # ADS7845EG4
Description  5-WIRE TOUCH SCREEN INTERFACE, RATIOMETRIC CONVERSION, SINGLE SUPPLY:2V to 5V
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

ADS7845EG4 Datasheet(HTML) 9 Page - Texas Instruments

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®
9
ADS7845
single-ended mode, the converter’s reference voltage is
always the difference between the VREF and GND pins. In
differential mode, the reference voltage is the difference
between the currently enabled switches. See Tables I and II
and Figures 2 through 4 for more information. The last two
bits (PD1 - PD0) select the power- down mode as shown in
Table V. If both inputs are HIGH, the device is always
powered up. If both inputs are LOW, the device enters a
power-down mode between conversions. When a new con-
version is initiated, the device will resume normal operation
instantly—no delay is needed to allow the device to power
up and the very first conversion will be valid. There are two
power-down modes: one where PENIRQ is disabled and
one where it is enabled.
PD1
PD0
PENIRQ
DESCRIPTION
0
0
Enabled
Power-down between conversions. When each
conversion is finished, the converter enters a
LOW power mode. At the start of the next con-
version, the device instantly powers up to full
power. There is no need for additional delays to
assure full operation and the very first conversion
is valid. The LR– switch is on while in power-down.
0
1
Disabled
Same as mode 00, except PENIRQ is disabled.
The LR– switch is off while in power-down mode.
1
0
Disabled
Reserved for future use.
1
1
Disabled
No power down between conversions, device is
always powered.
FIGURE 5. Conversion Timing, 24 Clocks per Conversion, 8-Bit Bus Interface. No DCLK Delay Required with Dedicated
Serial Port.
TABLE V. Power-Down Selection.
FIGURE 6. Conversion Timing, 16 Clocks per Conversion, 8-Bit Bus Interface. No DCLK Delay Required with Dedicated
Serial Port.
1
DCLK
CS
81
11
DOUT
BUSY
S
DIN
CONTROL BITS
S
CONTROL BITS
10
98765
4
3210
11 10
9
81
1
8
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
ON
OFF
OFF
OFF
OFF
DIN
A1
A0 MODE
SER/
DFR PD1 PD0
10
98765
4
3210
Zero Filled...
81
8
NOTES: (1) For Y Position, Driver 1 is ON and Driver 2 is OFF. For X Position, Driver 1 is OFF and Driver 2 is ON. LR
will turn on when power-down mode is entered and PD1, PD0 = 00B. (2) Drivers will remain on if power-down mode is
11B (no power down) until selected input channel, reference mode, or power-down mode is changed, or CS is HIGH.


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