MAX11803ETC+T Maxim Integrated Products, MAX11803ETC+T Datasheet - Page 25

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MAX11803ETC+T

Manufacturer Part Number
MAX11803ETC+T
Description
IC TOUCH SCREEN CTLR 12-TQFN
Manufacturer
Maxim Integrated Products
Type
Resistiver
Datasheet

Specifications of MAX11803ETC+T

Touch Panel Interface
4-Wire
Number Of Inputs/keys
1 TSC
Resolution (bits)
12 b
Data Interface
I²C, Serial
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-TQFN Exposed Pad
Voltage Supply Source
Single Supply
Sampling Rate (per Second)
105k
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Figure 8. State Machine Transitions (Direct Conversion Mode)—MAX11800–MAX11803
When a touch is present on the panel in edge interrupt
mode, the MAX11800–MAX11803 return to an untimed
Table 6. Measurement and Event Tags
(Continuous Interrupt Mode)
Low-Power, Ultra-Small Resistive Touch-Screen
Touch (data valid)
N/A (not used)
No touch present (data invalid)
Measurement in progress (data invalid)
COMMAND
COMMAND
COMMAND
MEASUREMENT
NO
NO
NO
EVENT
Z1
Z2
X
Y
______________________________________________________________________________________
SETUP
PANEL
SETUP
PANEL
SETUP
PANEL
X
Y
Z
INTERNAL TRANSITION
USER COMMAND
CONVERSION
AVERAGE
Edge Interrupt Mode
Controllers with I
MTAG[3:2]
ETAG[1:0]
DETECT
X
00
01
10
11
00
01
10
11
CONVERSION
CONTINUOUS
LAST
DONE AND
DETECT
TOUCH
ACQUIRE
Y
high-impedance mode once data tagging operations are
complete. In edge interrupt mode, the duration of a touch
is determined by the tags applied to the measurement
data. Data tagged as initial (00) or midpress (01) indicates
the user needs to continue to scan the panel until a
release is observed. In this state, there is no need to con-
tinue monitoring the touch status prior to the next request-
ed measurement. If a panel touch is not present, data is
tagged as release (10) and the MAX11800–MAX11803
idle in TDM continuously, issuing an interrupt only when
the next panel touch is initiated.
The operation described in the preceding paragraph
makes the edge interrupt mode more power-efficient
than the continuous interrupt mode. However, the edge
interrupt mode requires continuous scanning of the
panel until a release (10) event is observed. Otherwise,
the MAX11800–MAX11803 do not idle in TDM and are
not able to recognize a change in touch status. New
touches are not recognized and new interrupts are not
issued if a release event is not detected before stop-
ping the conversion sequence.
ACQUIRE
TOUCH-
PULLUP
DETECT
Z1
FINE
ACQUIRE
2
TIME IS UP
Z2
CONVERSION
AVERAGE
C/SPI Interface
TIME IS UP
ACQUIRE
AUX
CONVERSION
CONTINUOUS
LAST
DONE AND
TOUCH-
DETECT
PULLUP
FINE
25

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