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參數(shù)資料
| 型號： | 9534 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 8-bit I2C and SMBus, low power I/O port with interrupt |
| 中文描述： | 8位I2C和SMBus，低功率的I / O端口中斷 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大?。?/td> | 146K |
| 代理商： | 9534 |
Philips Semiconductors
Product data sheet
PCA9534
8-bit I
2
C and SMBus low power I/O port with interrupt
2004 Sep 30
8
TYPICAL APPLICATION
SW2093
I/O
1
I/O
2
I/O
3
I/O
4
I/O
5
I/O
6
I/O
7
V
(5 V)
V
DD
SCL
SDA
INT
RESET
MASTER
CONTROLLER
GND
PCA9534
A2
A1
A0
V
SS
V
DD
SUBSYSTEM 3
(e.g. alarm
system)
SUBSYSTEM 2
(e.g. counter)
INT
V
DD
ALARM
Controlled Switch
(e.g. CBT device)
ENABLE
10 k
10 k
10 k
2 k
NOTE:
Device address configured as 0100100 for this example
I/O
0
, I/O
1
, I/O
2
, configured as outputs
I/O
3
, I/O
4
, I/O
, configured as inputs
I/O
06
, I/O
7
, are not used and have to be configured as outputs
A
B
10 k
INT
100 k
(
×
3)
Figure 10. Typical application
Minimizing I
DD
when the I/O is used to control LEDs
When the I/Os are used to control LEDs, they are normally connected to V
DD
through a resistor as shown in Figure 10. Since the LED acts as a
diode, when the LED is off the I/O V
IN
is about 1.2 V less than V
DD
. The supply current, I
DD
, increases as V
IN
becomes lower than V
DD
and is
specified as
I
DD
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 V
DD
when the LED is off. Figure 11 shows a high value resistor in parallel with the LED. Figure 12 shows V
DD
less than the LED supply
voltage by at least 1.2 V. Both of these methods maintain the I/O V
IN
at or above V
DD
and prevents additional supply current consumption when
the LED is off.
V
DD
V
DD
LEDx
LED
100 k
SW02086
Figure 11. High value resistor in parallel with the LED
V
DD
3.3 V
LEDx
LED
SW02087
5 V
Figure 12. Device supplied by a lower voltage
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