SX8652IWLTRT Semtech, SX8652IWLTRT Datasheet - Page 23

• Manufacturer Part Number: SX8652IWLTRT
• Description: IC TOUCH SCREEN CTRLR 14DFN
• Manufacturer: Semtech
• Type: Resistiver

Specifications of SX8652IWLTRT

• Touch Panel Interface: 4-Wire, 5-Wire
• Number Of Inputs/keys: 2 Key
• Resolution (bits): 12 b
• Data Interface: Serial, SPI™
• Data Rate/sampling Rate (sps, Bps): 74k
• Voltage Reference: Internal
• Voltage - Supply: 1.65 V ~ 3.7 V
• Current - Supply: 10mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-DFN
• Voltage Supply Source: Single Supply
• Sampling Rate (per Second): 74k
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: SX8652IWLTR

9.7. SX8652 register
Revision V1.7/October 2010
©2010 Semtech Corp.
ADVANCED COMMUNICATIONS & SENSING
RegCtrl0
RegCtrl1
RegCtrl2
Register
Bit Default
7:4
3:0
7:6
3:2
1:0
7:4
3:0
5
4
0000
0000
0000
00
00
00
1
0
0
RATE
POWDLY
AUXAQC
CONDIRQ
SCREEN
RPDNT
FILT
reserved
SETDLY
Table 15. SX8652 Register
Set rate in coordinates per sec (cps) (± 20%)
If RATE =0: Manual mode. if RATE >0: Automatic mode
0000: Timer disabled -Manual mode
0001: 10 cps
0010: 20 cps
0011: 40 cps
0100: 60 cps
0101: 80 cps
0110: 100 cps
0111: 200 cps
Conversion (or first conversion when filtering is enabled) settling time (± 10%)
0000: Immediate (0.5 us)
0001: 1.1 us
0010: 2.2 us
0011: 4.4 us
0100: 8.9 us
0101: 17.8 us
0110: 35.5 us
0111: 71.0 us
00: AUX is used as an analog input (4-
wire only)
01: On rising AUX edge, wait POWDLY
and start acquisition
The AUX trigger works only in manual mode with 4-wire touchscreen
Enable conditional interrupts
0: interrupt always generated at end of
conversion cycle. If no pen is detected
the data is set to ‘invalid qualified’.
Select the type of screen:
0: 4-wire
Select the Pen Detect Resistor
00: 100 kOhm
01: 200 kOhm
Digital filter control
00: Disable
01: 3 sample averaging
Settling time while filtering (± 10%)
0000: Immediate (0.5 us)
0001: 1.1 us
0010: 2.2 us
0011: 4.4 us
0100: 8.9 us
0101: 17.8 us
0110: 35.5 us
0111: 71.0 us
15kV ESD Low Power 4-Wire / 5-Wire Resistive
Page 23
Touchscreen Controller with SPI Interface
Description
1000: 300 cps
1001: 400 cps
1010: 500 cps
1011: 1k cps
1100: 2k cps
1101: 3k cps
1110: 4k cps
1111: 5k cps
1000: 0.14 ms
1001: 0.28 ms
1010: 0.57 ms
1011: 1.14 ms
1100: 2.27 ms
1101: 4.55 ms
1110: 9.09 ms
1111: 18.19 ms
10: On falling AUX edge, wait POWDLY
and start acquisition
11: On rising and falling AUX edges,
wait POWDLY and start acquisition
1: interrupt generated when pen detect
is successful
1: 5 -wire
10: 50 kOhm
11: 25 kOhm
10: 5 sample averaging
11: 7 sample acquisition, sort, average 3
middle samples
1000: 0.14 ms
1001: 0.28 ms
1010: 0.57 ms
1011: 1.14 ms
1100: 2.27 ms
1101: 4.55 ms
1110: 9.09 ms
1111: 18.19 ms
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SX8652