MAX1234ETI+T Maxim Integrated Products, MAX1234ETI+T Datasheet - Page 14

• Manufacturer Part Number: MAX1234ETI+T
• Description: IC CNTRLR TOUCH 28-TQFN
• Manufacturer: Maxim Integrated Products
• Type: Resistiver

Specifications of MAX1234ETI+T

• Touch Panel Interface: 4-Wire
• Number Of Inputs/keys: 1, 4 x 4 Keypad
• Resolution (bits): 8, 10, 12 b
• Data Interface: MICROWIRE™, QSPI™, Serial, SPI™
• Data Rate/sampling Rate (sps, Bps): 50k
• Voltage Reference: Internal
• Voltage - Supply: 4.75 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-TQFN Exposed Pad
• Applications: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

±15kV ESD-Protected Touch-Screen
Controllers Include DAC and Keypad Controller
Internal protection diodes that clamp the analog input
to AV
from GND - 0.3V to AV
Analog inputs must not exceed AV
50mV or be lower than GND by more than 50mV for
accurate conversions. If an off-channel analog input
voltage exceeds the supplies, limit the input current to
50mA. All analog inputs are also fully ESD protected
Figure 3. Simplified Diagram of Analog Input Section
14
______________________________________________________________________________________
DD
and GND allow the analog input pins to swing
V
V
AUX1
AUX2
GND
BAT1
BAT2
X+
Y+
X-
Y-
7.5kΩ
7.5kΩ
TEMP2
2.5kΩ
BATTERY
DD
TEMP1
ON
+ 0.3V without damage.
Analog Input Protection
DD
2.5kΩ
BATTERY
by more than
ON
+AV
DD
V
REF
to ±8kV, using the Contact-Discharge method and
±15kV using the Air-Gap method specified in IEC-
1000-4-2.
The MAX1233/MAX1234 offer an internal voltage refer-
ence for the ADC that can be set to +1.0V or +2.5V. The
MAX1233/MAX1234 typically use the internal reference
for battery monitoring, temperature measurement, and for
REFERENCE
2.5V/1.0V
REF ON/OFF
MAX1233
MAX1234
+IN
-IN
Reference for ADC
CONVERTER
Internal Reference
+REF
-REF