PCA9550D,112 NXP Semiconductors, PCA9550D,112 Datasheet - Page 5

• Manufacturer Part Number: PCA9550D,112
• Description: IC LED DRIVER BLINKER 8-SOIC
• Manufacturer: NXP Semiconductors
• Type: LED Blinkerr

Specifications of PCA9550D,112

• 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
• Mounting Style: SMD/SMT
• 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: Details
• Other names: 568-1046-5; 935272882112; PCA9550D

NXP Semiconductors
PCA9550_5
Product data sheet
6.2.1 Control register definition
6.3.1 INPUT - Input register
6.3.2 PSC0 - Frequency Prescaler 0
6.3.3 PWM0 - Pulse Width Modulation 0
6.3 Register descriptions
Table 4.
The INPUT register reflects the state of the device pins. Writes to this register will be
acknowledged but will have no effect.
Table 5.
Remark: The default value ‘X’ is determined by the externally applied logic level (normally
logic 1) when used for directly driving LED with pull-up to V
PSC0 is used to program the period of the PWM output.
The period of BLINK0 = (PSC0 + 1) / 44.
Table 6.
The PWM0 register determines the duty cycle of BLINK0. The outputs are LOW (LED off)
when the count is less than the value in PWM0 and HIGH when it is greater. If PWM0 is
programmed with 00h, then the PWM0 output is always LOW.
The duty cycle of BLINK0 = (256
Table 7.
B2
0
0
0
0
1
1
Bit
Symbol
Default
Bit
Symbol
Default
Bit
Symbol
Default
B1
0
0
1
1
0
0
Register summary
INPUT - Input register description
PSC0 - Frequency Prescaler 0 register description
PSC0[7]
PWM0 - Pulse Width Modulation 0 register description
PWM0
[7]
7
0
7
1
7
1
B0
0
1
0
1
0
1
PSC0[6]
Register name
INPUT
PSC0
PWM0
PSC1
PWM1
LS0
PWM0
Rev. 05 — 13 October 2008
[6]
6
0
6
1
6
0
2-bit I
PSC0[5]
PWM0
[5]
5
0
5
1
5
0
PWM0) / 256.
not used
2
C-bus LED driver with programmable blink rates
PSC0[4]
PWM0
Access
read only
read/write
read/write
read/write
read/write
read/write
[4]
4
0
4
1
4
0
PSC0[3]
PWM0
[3]
3
0
3
1
3
0
Description
input register
frequency prescaler 0
PWM register 0
frequency prescaler 1
PWM register 1
LED selector
DD
PSC0[2]
PWM0
.
[2]
2
2
2
0
0
1
PCA9550
PSC0[1]
© NXP B.V. 2008. All rights reserved.
PWM0
LED1
[1]
X
1
1
1
1
0
PSC0[0]
PWM0
LED0
[0]
X
0
0
1
0
0
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