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參數(shù)資料
| 型號： | PCA9537 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 4-bit I2C and SMBus low power I/O port with interrupt and reset |
| 中文描述： | 4位I2C和SMBus低功率的I / O端口中斷和復(fù)位 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大小： | 163K |
| 代理商： | PCA9537 |
Philips Semiconductors
4-bit I
2
C and SMBus low power I/O port
with interrupt and reset
Product data sheet
PCA9537
2004 Nov 29
8
TYPICAL APPLICATION
SW02189
I/O
0
I/O
1
I/O
2
I/O
3
V
(5 V)
V
DD
SCL
SDA
INT
RESET
MASTER
CONTROLLER
GND
SCL
SDA
PCA9537
V
SS
SUBSYSTEM 2
(e.g. counter)
SUBSYSTEM 1
(e.g. temp sensor)
INT
V
DD
Controlled Switch
(e.g. CBT device)
ENABLE
10 k
10 k
10 k
2 k
NOTE:
Device address is 1001001 for this example
I/O
0
, I/O
, I/O
, configured as outputs
I/O
1
, configured as input
A
B
INT
100 k
10 k
RESET
RESET
Figure 9. 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 9. 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 10 shows a high value resistor in parallel with the LED. Figure 11 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
I/Ox
LED
100 k
SW02326
Figure 10. High value resistor in parallel with the LED
V
DD
3.3 V
I/Ox
LED
SW02327
5 V
Figure 11. Device supplied by a lower voltage
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCA9537DP | 制造商:NXP Semiconductors 功能描述:IC IO PORT I2C/SMBUS 4BIT 1 制造商:NXP Semiconductors 功能描述:IC, IO PORT, I2C/SMBUS 4BIT, 10TSSOP 制造商:NXP Semiconductors 功能描述:IC, IO PORT, I2C/SMBUS 4BIT, 10TSSOP; Chip Configuration:4bit; Bus Frequency:400kHz; Interface Type:I2C, SMBus; Supply Voltage Min:2.3V; Supply Voltage Max:5.5V; Digital IC Case Style:TSSOP; No. of Pins:10; No. of I/O's:4; MSL:MSL 1 ;RoHS Compliant: Yes |
| PCA9537DP,118 | 功能描述:接口-I/O擴(kuò)展器 I2C/SMBUS 4BIT GPIO RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| PCA9537DP.118 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:4-bit I2C-bus and SMBus low power I/O port with interrupt and reset |
| PCA9537DP118 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
| PCA9538 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:8-bit I2C and SMBus low power I/O port with interrupt and reset |
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