MAX11800GTC/V+T Maxim Integrated Products, MAX11800GTC/V+T Datasheet - Page 22

• Manufacturer Part Number: MAX11800GTC/V+T
• Description: IC TOUCH SCREEN CTRLR LP 12WQFN
• Manufacturer: Maxim Integrated Products
• Type: Resistiver

Specifications of MAX11800GTC/V+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 ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 12-WQFN Exposed Pad
• Voltage Supply Source: Single Supply
• Sampling Rate (per Second): 105k
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Low-Power, Ultra-Small Resistive Touch-Screen
Controllers with I
Figure 7. Touch-Detection Operations
22
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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.