MAX11802EWC+T Maxim Integrated Products, MAX11802EWC+T Datasheet - Page 22

IC TOUCH SCREEN CTLR 12-WLP

MAX11802EWC+T

Manufacturer Part Number
MAX11802EWC+T
Description
IC TOUCH SCREEN CTLR 12-WLP
Manufacturer
Maxim Integrated Products
Type
Resistiver
Datasheet

Specifications of MAX11802EWC+T

Touch Panel Interface
4-Wire
Number Of Inputs/keys
1 TSC
Resolution (bits)
12 b
Data Interface
Serial, SPI™
Data Rate/sampling Rate (sps, Bps)
105k
Voltage - Supply
1.7 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
12-WLP
Voltage Supply Source
Single Supply
Sampling Rate (per Second)
105k
Resolution
11 bits
Interface Type
I2C, SPI
Supply Voltage (max)
3.6 V
Supply Voltage (min)
1.7 V
Conversion Rate
34.4 KSPs
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
MAX11802EWC+T
MAX11802EWC+TTR
Low-Power, Ultra-Small Resistive Touch-Screen
Controllers with I
Figure 7. Touch-Detection Operations
22
______________________________________________________________________________________
V
V
DD
DD
FAST PULLUP TOUCH DETECTION
DIGITAL WAVEFORM
ANALOG WAVEFORM
NORMAL TOUCH DETECTION
DIGITAL WAVEFORM
ANALOG WAVEFORM
MEASUREMENT COMPLETE—
MEASUREMENT COMPLETE—
DETERMINED BY LAST SCAN
DETERMINED BY LAST SCAN
INITIAL INPUT VOLTAGE
INITIAL INPUT VOLTAGE
DATA IS KNOWN
DATA IS KNOWN
SCAN MODE
SCAN MODE
ACTIVITY
ACTIVITY
POWER ASSISTED PULLUP PERIOD (10Ω)
(NOTE: NO PUR PERIOD; ALLOW LONG PULLUP TIMES)
PANEL IS ALLOWED TO RESETTLE BEFORE DETERMINING DATA VALIDITY
(NOTE: INCREASED CURRENT IN PUR MODE DURING TOUCH)
FORCED FAST PULLUP USING
10Ω SWITCH
2
(OPTIONAL)
PUR MODE
C/SPI Interface
(THROUGH 50kΩ/100kΩ PULLUP)
PUF MODE
TOUCH NOT PRESENT:
TSC INPUT PULLED HIGH THROUGH 50kΩ/100kΩ PULLUP
TIME
TIME
TOUCH PRESENT:
TSC INPUT PULLED LOW BY PANEL
DATA VALIDITY IS DETERMINED
DATA VALIDITY IS DETERMINED
PANEL IS ALLOWED TO RESETTLE BEFORE
(DATA IS TAGGED)
(DATA IS TAGGED)
DETERMINING DATA VALIDITY
PUF MODE
TOUCH NOT PRESENT: TSC INPUT
REMAINS HIGH
TOUCH PRESENT:
TSC INPUT PULLED LOW
IS THERE A TOUCH?
IS THERE A TOUCH?
TOUCH DETECT
TOUCH DETECT
YES = LPM.
YES = LPM.
NO = TDM.
NO = TDM.

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