STMPE821QTR STMicroelectronics, STMPE821QTR Datasheet - Page 41

• Manufacturer Part Number: STMPE821QTR
• Description: IC CTLR TOUCH KEY 8CH CAP 16-QFN
• Manufacturer: STMicroelectronics
• Type: Capacitiver

Specifications of STMPE821QTR

• Number Of Inputs/keys: 8 Key
• Data Interface: I²C
• Voltage - Supply: 1.65 V ~ 1.95 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-QFN
• Voltage Supply Source: Single Supply
• Resolution: 7 bit to 10 bit
• Interface Type: I2C
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Number Of Channels: 8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sampling Rate (per Second): -
• Resolution (bits): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-8826-2

STMPE821
Basic PWM controller
Figure 9.
Ramps with programmable brightness, ON/OFF period and repetition
1 time
Duty
unit
cycle
Time
ON
Off
ON
Off
period
period
period
period
CS00055
“On” period = period 0[1:0] * time unit [3:0]
“Off” period = period 1[1:0] * time unit [3:0]
Duty cycle during “on” period = brightness [7:4]
Number of cycles = repetition [3:0]
Ramp up rate is programmable.
Figure 10. Fixed brightness output
time unit
Duty cycle
Time
CS00056
“On” period = period 0[1:0] * time unit [3:0]
Off period = don't care
Duty cycle during “on” period = brightness [7:4]
Number of cycles = repetition [3:0] = 0 (means infinite repetition)
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