STMPE821QTR STMicroelectronics, STMPE821QTR Datasheet - Page 35

• 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
9
Basic PWM controller
The advanced PWM allows complex brightness and blinking control of a LED. The basic
PWM controller allows simpler brightness control and basic blinking patterns. The
STMPE821 is fitted with a 4-channel basic PWM controller.
The PWM controllers outputs are connected to the GPIO 0-3. In order to activate the PWM
channels, the alternate function bits in the master enable register must be set to '1'. The
PWM controllers are capable of generating the following brightness patterns:
Figure 8.
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 mode is disabled
cycle
Duty
Pulses with programmable brightness, ON/OFF period and repetition
period
On
period
Off
Doc ID 14478 Rev 5
1 time
unit
period
ON
period
Off
Basic PWM controller
Time
CS00054
35/50