STMPE321QTR STMicroelectronics, STMPE321QTR Datasheet - Page 9

• Manufacturer Part Number: STMPE321QTR
• Description: IC CTLR TOUCH KEY 3CH 12-QFN
• Manufacturer: STMicroelectronics
• Series: S-Touch™r
• Type: Capacitiver

Specifications of STMPE321QTR

• Number Of Inputs/keys: 3 Key
• Resolution (bits): 8 b
• Data Interface: I²C
• Data Rate/sampling Rate (sps, Bps): 100k
• Voltage - Supply: 1.65 V ~ 1.95 V
• Mounting Type: Surface Mount
• Package / Case: 12-QFN
• Voltage Supply Source: Single Supply
• Resolution: 7 bit to 10 bit
• Interface Type: I2C
• Supply Voltage (max): 1.95 V
• Supply Voltage (min): 1.65 V
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Sampling Rate (per Second): -
• Lead Free Status / Rohs Status: Details
• Other names: 497-8985-2

STMPE321
2.2
Power management
The STMPE321 operates in 3 states, as described below:
Figure 5.
On RESET, the STMPE321 enters the ACTIVE state immediately.
Upon a fixed period of inactivity, the device enters a SLEEP state. Any touch activity
occurring during a SLEEP state causes the device to return to an ACTIVE state.
In SLEEP mode:
-Calibration continues if the F2A bit is set in the CONTROL register
-Calibration stops if the F2A bit is NOT set in the CONTROL register
If no touch activity is expected, the host may set the device to a HIBERNATE state to save
power.
If any key is touched and held, the I
hold until the key is released.
STMPE321 operating states
Doc ID 15791 Rev 3
2
C command to enter SLEEP or HIBERNATE is put on
Capacitance compensation
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