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參數(shù)資料
| 型號： | 935272775118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8 I/O, PIA-GENERAL PURPOSE, PQCC16 |
| 封裝： | 4 X 4 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT-629-1, HVQFN-16 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 153K |
| 代理商： | 935272775118 |
Philips Semiconductors
Product data
PCA9557
8-bit I2C and SMBus I/0 port with reset
2002 Dec 13
12
TYPICAL APPLICATION
SW00993
I/00
I/01
I/02
I/03
I/04
I/05
I/06
I/07
VDD
SCL
SDA
RESET
MASTER
CONTROLLER
GND
SCL
SDA
PCA9557
A2
A1
A0
GND
VDD
SUBSYSTEM 3
(e.g. alarm
system)
SUBSYSTEM 2
(e.g. counter)
SUBSYSTEM 1
(e.g. temp sensor)
INT
VDD
ALARM
Controlled Switch
(e.g. CBT device)
ENABLE
1.6 k
1.6 k
1.1 k
2 k
NOTE: Device address configured as 0011100 for this example
I/00, I/01, I/02, configured as outputs
I/03, I/04, I/05, configured as inputs
I/006, I/07, are not used and have to be configured as outputs
A
B
2 k
Figure 17. Typical application
Minimizing IDD when the I/O is used to control LEDs
When the I/Os are used to control LEDs, they are normally connected to VDD through a resistor as shown in Figure 17. Since the LED acts as a
diode, when the LED is off the I/O VIN is about 1.2 V less than VDD. The supply current , IDD, increases as VIN becomes lower than VDD and is
specified as
IDD in the DC characteristics table.
Designs needing to minimize current consumption, such as battery power applications, should consider maintaining the I/O pins greater than or
equal to VDD when the LED is off. Figure 18 shows a high value resistor in parallel with the LED. Figure 19 shows VDD less than the LED supply
voltage by at least 1.2 V. Both of these methods maintain the I/O VIN at or above VDD and prevents additional supply current consumption when
the LED is off.
VDD
LEDx
LED
100 k
SW02086
Figure 18. High value resistor in parallel with the LED
VDD
3.3 V
LEDx
LED
SW02087
5 V
Figure 19. Device supplied by a lower voltage
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