PCA9553D/01 NXP Semiconductors, PCA9553D/01 Datasheet - Page 7

• Manufacturer Part Number: PCA9553D/01
• Description: LED Drivers LED DRVR 4BIT I2C
• Manufacturer: NXP Semiconductors

Specifications of PCA9553D/01

• Number Of Segments: 4
• Low Level Output Current: 25000 uA (Min)
• 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
• Package / Case: SOT-96
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: PCA9553D/01,112

NXP Semiconductors
PCA9553_6
Product data sheet
7.3.4 PSC1 - Frequency Prescaler 1
7.3.5 PWM1 - Pulse Width Modulation 1
7.3.6 LS0 - LED selector register
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.
Legend: * default value.
Bit
Symbol
Default
Bit
Symbol
Default
Register
LS0 - LED0 to LED3 selector
LS0
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 bit description
PWM1
Bit
7:6
5:4
3:2
1:0
[7]
7
1
7
1
PSC1[6]
Rev. 06 — 29 December 2008
PWM1
Value
01*
01*
01*
01*
[6]
6
1
6
0
4-bit I
PSC1[5]
PWM1
[5]
5
1
5
0
Description
LED3 selected
LED2 selected
LED1 selected
LED0 selected
PWM1) / 256.
2
C-bus LED driver with programmable blink rates
PSC1[4]
PWM1
[4]
4
1
4
0
PSC1[3]
PWM1
[3]
3
1
3
0
PSC1[2]
PWM1
[2]
2
2
0
1
PCA9553
PSC1[1]
© NXP B.V. 2008. All rights reserved.
PWM1
[1]
1
1
1
0
PSC1[0]
PWM1
[0]
0
1
0
0
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