mxb7846 Maxim Integrated Products, Inc., mxb7846 Datasheet - Page 8

• Manufacturer Part Number: mxb7846
• Description: Mxb7846 2.375v To 5.25v, 4-wire Touch-screen Controller With Internal Reference And Temperature Sensor
• Manufacturer: Maxim Integrated Products, Inc.

Figure 1. Detailed Serial Interface Timing
2.375V to 5.25V, 4-Wire Touch-Screen Controller
with Internal Reference and Temperature Sensor
8
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PIN
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
CS
DCLK
DIN
DOUT
BUSY
PENIRQ
NAME
DOUT
BUSY
DCLK
GND
BAT
AUX
V
REF
V
DIN
X+
Y+
CS
X-
Y-
DD
DD
Positive Supply Voltage. Connect to pin 10.
X+ Position Input, ADC Input Channel 1
Y+ Position Input, ADC Input Channel 2
X- Position Input
Y- Position Input
Ground
Battery Monitoring Inputs; ADC Input Channel 3
Auxiliary Input to ADC; ADC Input Channel 4
Voltage Reference Output/Input. Reference voltage for analog-to-digital conversion. In internal
reference mode, the reference buffer provides a 2.50V nominal output. In external reference mode,
apply a reference voltage between 1V and V
Positive Supply Voltage, +2.375V (2.70V) to +5.25V. External (internal) reference. Bypass with a 1µF
capacitor. Connect to pin 1.
Pen Interrupt Output. Open anode output. 10k to 100k pullup resistor required to V
Serial Data Output. Data changes state on the falling edge of DCLK. High impedance when CS is
HIGH.
Busy Output. BUSY pulses high for one clock period before the MSB decision. High impedance when
CS is HIGH.
Serial Data Input. Data clocked in on the rising edge of DCLK.
Active-Low Chip Select. Data is only clocked into DIN when CS is low. When CS is HIGH, DOUT and
BUSY are high impedance.
Serial Clock Input. Clocks data in and out of the serial interface and sets the conversion speed (duty
cycle must be 40% to 60%).
t
t
CSS
DV
t
DS
t
BDV
t
DH
t
CL
t
CH
t
CP
DD
t
BD
FUNCTION
. Bypass REF to GND with a 0.1µF capacitor.
t
DO
t
t
BTR
TR
Pin Description
t
CSH
DD
.