STMPE821QTR STMicroelectronics, STMPE821QTR Datasheet - Page 39

• 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
PWM_n_SETUP
Address:
Type:
Reset:
Description:
7
[7:4] BRIGHTNESS:
[3:1] TIMING[3:0] is the time unit from which the duration of the ON period and OFF period is
[0] Write '1' to activate ramp mode
6
0xB0
R/W
0x00
PWM setup register.
This defines the duty cycle during the ON period of the PWM channel output which in turn
determines the brightness level of the LED that the PWM output drives.
0000: Duty cycle ratio 1:15 (6.25%, minimum brightness)
0001: Duty cycle ratio 2:14 (12.50%)
0010: Duty cycle ratio 3:13 (18.75%)
0011: Duty cycle ratio 4:12 (25.00%)
0100: Duty cycle ratio 5:11 (31.25%)
0101: Duty cycle ratio 6:10 (37.50%)
0110: Duty cycle ratio 7: 9 (43.75%)
0111: Duty cycle ratio 8: 8 (50.00%)
1000: Duty cycle ratio 9: 7 (56.25%)
1001: Duty cycle ratio 10: 6 (62.50%)
1010: Duty cycle ratio 11: 5 (68.75%)
1011: Duty cycle ratio 12: 4 (75.00%)
1100: Duty cycle ratio 13: 3 (81.25%)
1101: Duty cycle ratio 14: 2 (87.50%)
1110: Duty cycle ratio 15: 1 (93.75%)
1111: Duty cycle ratio 16: 0 (100.00%, maximum brightness)
defined in:
"000" = 20 mS
"001" = 40 mS
"010" = 80 mS
"011" = 160 mS
"100" = 320 mS
"101" = 640 mS
"110" = 1280 mS
"111" = 2560 mS
BRIGHTNESS
5
Doc ID 14478 Rev 5
4
3
PWM_n setup register (n=0-3)
2
TIMING
Basic PWM controller
1
0
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