参数资料
型号: PCA9550D,118
厂商: NXP Semiconductors
文件页数: 12/26页
文件大小: 0K
描述: IC LED DRIVER BLINKER 8-SOIC
标准包装: 2,500
拓扑: 开路漏极,PWM
输出数: 2
内部驱动器:
类型 - 主要: LED 闪烁器
频率: 400kHz
电源电压: 2.3 V ~ 5.5 V
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SO
包装: 带卷 (TR)
工作温度: -40°C ~ 85°C
配用: 568-4002-ND - DEMO BOARD I2C
其它名称: 935272882118
PCA9550D-T
PCA9550D-T-ND
NXP Semiconductors
PCA9550
2-bit I 2 C-bus LED driver with programmable blink rates
8.2 Programming example
The following example will show how to set LED0 to blink at 1 Hz at a 50 % duty cycle.
LED1 will be set to blink at 4 Hz and at a 25 % duty cycle.
Table 11.
Programming PCA9550
Program sequence
START
PCA9550 address with A0 = LOW
PSC0 subaddress + Auto-Increment
Set prescaler PSC0 to achieve a period of 1 second:
PSC0 + 1
Blink period = 1 = ------------------------
44
PSC0 = 43
Set PWM0 duty cycle to 50 %:
256 – PWM0
-------------------------------- = 0.5
256
PWM0 = 128
Set prescaler PSC1 to achieve a period of 0.25 seconds:
PSC1 + 1
Blink period = 0.25 = ------------------------
44
PSC1 = 10
Set PWM1 output duty cycle to 25 %:
256 – PWM1
-------------------------------- = 0.25
256
PWM1 = 192
Set LED0 to PWM0, and set LED1 to blink at PWM1
STOP
9. Limiting values
Table 12. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
I 2 C-bus
S
C0h
11h
2Bh
80h
0Ah
C0h
0Eh
P
Symbol
V DD
V I/O
I O(LEDn)
I SS
P tot
T stg
T amb
Parameter
supply voltage
voltage on an input/output pin
output current on pin LEDn
ground supply current
total power dissipation
storage temperature
ambient temperature
Conditions
operating
Min
? 0.5
V SS ? 0.5
-
-
-
? 65
? 40
Max
+6.0
5.5
± 25
50
400
+150
+85
Unit
V
V
mA
mA
mW
° C
° C
PCA9550_5
? NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 05 — 13 October 2008
12 of 26
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