AT42QT1070-MMH Atmel, AT42QT1070-MMH Datasheet - Page 22

• Manufacturer Part Number: AT42QT1070-MMH
• Description: IC TOUCH SENSOR 7KEY 20-VQFN
• Manufacturer: Atmel
• Type: Capacitiver

Specifications of AT42QT1070-MMH

• Number Of Inputs/keys: 7 Key (Comms), 5 Key (Standalone)
• Data Interface: I²C
• Voltage Reference: Internal
• Voltage - Supply: 1.8 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-VFQFN Exposed Pad
• Supply Voltage: 1.8 V to 5.5 V
• Dimensions: 3 mm L x 3 mm W x 0.8 mm H
• Temperature Range: - 40 C to + 85 C
• Termination Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -
• Resolution (bits): -
• Touch Panel Interface: -
• Data Rate/sampling Rate (sps, Bps): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

5.11
5.12
22
Address 53: FastOutDI/Max Cal/Guard Channel
Address 54: Low Power (LP) Mode
AT42QT1070
Table 5-11.
Table 5-12.
FO: Fast Out DI – when bit 5 is set then a key filters out with an integrator of 4. Could have a DI
in of 100 but filter out with DI of 4 (global setting for all keys).
MAX CAL: if this bit is clear then all keys recalibrate after a Max On Duration timeout, otherwise
only the key with the incorrect timing gets recalibrated.
GUARD CHANNEL: bits 0 – 3 are used to set a key as the guard channel (which gets priority
filtering). Valid values are 0 – 6, with any larger value disabling the guard key feature.
LP MODE: this 8-bit value determines the number of 8 ms intervals between key
measurements. Longer intervals between measurements yield a lower power consumption but
at the expense of a slower response to touch.
Default: 2 (16 ms between key acquisitions)
Address
Address
Setting
...254
53
54
255
0
1
2
3
4
Max On/Guard Channel
LP Mode
b7
b7
2.032s
2.040s
16 ms
24 ms
32 ms
Time
8 ms
8 ms
–
b6
b6
FO
b5
b5
MAX CAL
LOW POWER MODE
b4
b4
b3
b3
GUARD CHANNEL
b2
b2
b1
b1
9596A–AT42–10/10
b0
b0