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参数资料
| 型号： | MAX7314ATG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/25页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C 16B 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 接口： | I²C |
| 输入/输出数： | 18 |
| 中断输出： | 是 |
| 频率 - 时钟： | 400kHz |
| 电源电压： | 2 V ~ 3.6 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 管件 |
Applications Information
Hot Insertion
I/O ports P0–P15, interrupt output INT/O16, RST input,
BLINK input, and serial interface SDA, SCL, AD0 remain
high impedance with up to 6V asserted on them when
the MAX7314 is powered down (V+ = 0V). The MAX7314
can therefore be used in hot-swap applications.
Output Level Translation
The open-drain output architecture allows the ports to
level translate the outputs to higher or lower voltages
than the MAX7314 supply. An external pullup resistor
can be used on any output to convert the high-imped-
ance logic-high condition to a positive voltage level.
The resistor can be connected to any voltage up to
5.5V. For interfacing CMOS inputs, a pullup resistor
value of 220k
Ω is a good starting point. Use a lower
resistance to improve noise immunity, in applications
where power consumption is less critical, or where a
faster rise time is needed for a given capacitive load.
Driving LED Loads
When driving LEDs, a resistor in series with the LED
must be used to limit the LED current to no more than
50mA. Choose the resistor value according to the fol-
lowing formula:
RLED = (VSUPPLY - VLED - VOL) / ILED
where:
RLED is the resistance of the resistor in series with the
LED (
Ω).
VSUPPLY is the supply voltage used to drive the LED (V).
VLED is the forward voltage of the LED (V).
VOL is the output low voltage of the MAX7314 when
sinking ILED (V).
ILED is the desired operating current of the LED (A).
For example, to operate a 2.2V red LED at 14mA from a
5V supply, RLED = (5 - 2.2 - 0.25) / 0.014 = 182
Ω.
MAX7314
18-Port GPIO with LED Intensity Control,
Interrupt, and Hot-Insertion Protection
______________________________________________________________________________________
19
Table 12. PWM Intensity Settings (Blink Enabled)
EXAMPLES OF LED BLINK BEHAVIOR
(LED IS ON WHEN OUTPUT IS LOW)
PWM DUTY CYCLE
OUTPUT BLINK
PHASE X
REGISTER BIT = 0
PWM DUTY CYCLE
OUTPUT BLINK
PHASE X
REGISTER = 1
OUTPUT
(OR
GLOBAL)
INTENSITY
SETTING
LOW
TIME
HIGH
TIME
LOW
TIME
HIGH
TIME
BLINK PHASE 0
REGISTER BIT = 0
BLINK PHASE 1
REGISTER BIT = 1
BLINK PHASE 0
REGISTER BIT = 1
BLINK PHASE 1
REGISTER BIT = 0
0x0
1/16
15/16
1/16
0x1
2/16
14/16
2/16
0x2
3/16
13/16
3/16
0x3
4/16
12/16
4/16
0x4
5/16
11/16
5/16
0x5
6/16
10/16
6/16
0x6
7/16
9/16
7/16
Phase 0: LED on at low intensity
Phase 1: LED on at high intensity
Phase 0: LED on at high intensity
Phase 1: LED on at low intensity
0x7
8/16
Output is half intensity during both blink phases
0x8
9/16
7/16
9/16
0x9
10/16
6/16
10/16
0xA
11/16
5/16
11/16
0xB
12/16
4/16
12/16
0xC
13/16
3/16
13/16
0xD
14/16
2/16
14/16
0xE
15/16
1/16
15/16
Phase 0: LED on at high intensity
Phase 1: LED on at low intensity
Phase 0: LED on at low intensity
Phase 1: LED on at high intensity
0xF
Static low
Static high
impedance
Static high
impedance
Phase 0: LED on continuously
Phase 1: LED off continuously
Phase 0: LED off continuously
Phase 1: LED on continuously
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7314ATG+ | 功能描述:外围驱动器与原件 - PCI 18-Port GPIO RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| MAX7314ATG+T | 功能描述:接口-I/O扩展器 18-Port GPIO RoHS:否 制造商:NXP Semiconductors 逻辑系列: 输入/输出端数量: 最大工作频率:100 kHz 工作电源电压:1.65 V to 5.5 V 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:HVQFN-16 封装:Reel |
| MAX7314ATG-T | 功能描述:外围驱动器与原件 - PCI RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| MAX7314EVKIT+ | 功能描述:外围驱动器与原件 - PCI Evaluation Kit for the MAX7314 RoHS:否 制造商:PLX Technology 工作电源电压: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:FCBGA-1156 封装:Tray |
| MAX7315 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:8-Port I/O Expander with LED Intensity Control and Interrupt |
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