PCA9550D,118 NXP Semiconductors, PCA9550D,118 Datasheet - Page 6

• Manufacturer Part Number: PCA9550D,118
• Description: IC LED DRIVER BLINKER 8-SOIC
• Manufacturer: NXP Semiconductors
• Type: LED Blinkerr

Specifications of PCA9550D,118

• Package / Case: 8-SOIC (3.9mm Width)
• Topology: Open Drain, PWM
• Number Of Outputs: 2
• Internal Driver: Yes
• Type - Primary: LED Blinker
• Frequency: 400kHz
• Voltage - Supply: 2.3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 25mA
• Internal Switch(s): Yes
• Low Level Output Current: 25 mA
• Operating Supply Voltage: 2.3 V to 5.5 V
• Maximum Supply Current: 500 uA
• Maximum Power Dissipation: 400 mW
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: OM6285 - EVAL BOARD I2C-2002-1A568-4002 - DEMO BOARD I2C
• Voltage - Output: -
• Efficiency: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 935272882118; PCA9550D-T; PCA9550D-T

NXP Semiconductors
PCA9550_5
Product data sheet
6.3.4 PSC1 - Frequency Prescaler 1
6.3.5 PWM1 - Pulse Width Modulation 1
6.3.6 LS0 - LED selector
PSC1 is used to program the period of the PWM output.
The period of BLINK1 = (PSC1 + 1) / 44.
Table 8.
The PWM1 register determines the duty cycle of BLINK1. The outputs are LOW (LED off)
when the count is less than the value in PWM1 and HIGH when it is greater. If PWM1 is
programmed with 00h, then the PWM1 output is always LOW.
The duty cycle of BLINK1 = (256
Table 9.
The LS0 LED select register determines the source of the LED data.
Table 10.
Bit
Symbol
Default
Bit
Symbol
Default
Bit
Symbol
Default
00 = output is set LOW (LED on)
01 = output is set high-impedance (LED off; default)
10 = output blinks at PWM0 rate
11 = output blinks at PWM1 rate
PSC1 - Frequency Prescaler 1 register description
PSC1[7]
PWM1 - Pulse Width Modulation 1 register description
LS0 - LED selector register description
PWM1
[7]
7
1
7
1
7
1
PSC1[6]
PWM1
Rev. 05 — 13 October 2008
[6]
6
1
6
0
6
1
LS0[7:4]
2-bit I
PSC1[5]
PWM1
[5]
5
1
5
0
5
1
PWM1) / 256.
2
C-bus LED driver with programmable blink rates
PSC1[4]
PWM1
[4]
4
1
4
0
4
1
PSC1[3]
PWM1
[3]
3
1
3
0
3
0
LED1
PSC1[2]
PWM1
[2]
2
2
0
2
1
1
PCA9550
PSC1[1]
© NXP B.V. 2008. All rights reserved.
PWM1
[1]
1
1
1
0
1
0
LED0
PSC1[0]
PWM1
[0]
0
1
0
0
0
1
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