AT42QT1070-SSU Atmel, AT42QT1070-SSU Datasheet - Page 19

• Manufacturer Part Number: AT42QT1070-SSU
• Description: IC TOUCH SENSOR 7KEY 14-SOIC
• Manufacturer: Atmel
• Type: Capacitiver

Specifications of AT42QT1070-SSU

• 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: 14-SOIC (0.154", 3.90mm Width)
• 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

General Advice
Figure 2-5.
Effect of ESD Creepage On a Flex Tail
ESD Strike Here
Gap Beside
Panel
Panel
Zap!
Flex Tail
Sensor
(1)
Under extreme circumstances
, where extra ESD protection must be added, consider placing very low
capacitance (1 pF or less) varistors or transient suppressor devices near to the control chip.
If the creepage path is "broken" before the ESD meets the sensor, then this will block the creepage; for
example, if there is adhesive on the surface around and overlapping the electrode. Generally, creepage
occurs only on insulating uniform non-dissapative surfaces. This is a complex field of study that should
be considered but probably not over-analyzed; simple precautions usually suffice.
1. These include direct contact sensors or situations where such gaps are unavoidable.
Touch Sensors Design Guide
2-9
10620D–AT42–04/09