STMPE610QTR STMicroelectronics, STMPE610QTR Datasheet - Page 28

• Manufacturer Part Number: STMPE610QTR
• Description: IC CTLR ADV TOUCH SCREEN 16-QFN
• Manufacturer: STMicroelectronics
• Series: S-Touch™r
• Type: Resistiver

Specifications of STMPE610QTR

• Touch Panel Interface: 4-Wire
• Number Of Inputs/keys: 1 TSC
• Resolution (bits): 12 b
• Data Interface: I²C, Serial, SPI™
• Data Rate/sampling Rate (sps, Bps): 180k
• Voltage Reference: External
• Voltage - Supply: 1.65 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QFN
• Voltage Supply Source: Single Supply
• Sampling Rate (per Second): 180k
• Resolution: 12 bit
• Number Of Adc Inputs: 6
• Interface Type: I2C, SPI
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 1.65 V
• 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: 497-8825-2

Touchscreen controller
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Touchscreen controller
The STMPE610 is integrated with a hard-wired touchscreen controller for 4-wire resistive
type touchscreen. The touchscreen controller is able to operate completely autonomously,
and will interrupt the connected CPU only when a pre-defined event occurs.
Figure 9.
Driver and switch control unit
The driver and switch control unit allows coordination of the ADC and the MUX/switch. With
the coordination of this unit, a stream of data is produced at a selected frequency.
The touchscreen drivers can be configured with 2 current ratings: 20 mA or 50 mA. In the
case where multiple touch-down on the screen is causing a short, the current from the driver
is limited to these values. Tolerance of these current setting is +/- 25%.
Movement tracking
The "Tracking Index" in the TSC_CTRL register specifies a value, which determines the
distance between the current touch position and the previous touch position. If the distance
is shorter than the tracking index, it is discarded.
The tracking is calculated by summation of the horizontal and vertical movement. Movement
is only reported if:
(Current X - Previously Reported X) + (Current Y - Previously Reported Y) > Tracking Index
If pressure reporting is enabled (X/Y/Z), an increase in pressure will override the movement
tracking and report the new data set, even if X/Y is within the previous tracking index. This is
to ensure that a slow touch will not be discarded.
If pressure data is not used, select X/Y mode in touchscreen data acquisition. (Opmode field
in TSCControl register).
FIFO
Touchscreen controller block diagram
interrupt control
window tracking
Movement
FIFO
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switch control
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Driver
ADC
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drivers
Switch
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STMPE610