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參數(shù)資料
| 型號(hào)： | MAX7325ATG+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 7/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC I/O EXPANDER I2C 8B 24TQFN-EP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 75 |
| 接口： | I²C |
| 輸入/輸出數(shù)： | 8 |
| 中斷輸出： | 是 |
| 頻率 - 時(shí)鐘： | 400kHz |
| 電源電壓： | 1.71 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 24-TQFN-EP（4x4） |
| 包裝： | 管件 |
| 包括： | POR |
MAX7325
I2C Port Expander with 8 Push-Pull
and 8 Open-Drain I/Os
15
Maxim Integrated
diodes to V+ and GND continue to appear as a diode
clamp from each output to GND (Figure 10).
Each of the I/O ports P0–P7 has a protection diode to
GND (Figure 11). When a port is driven to a voltage
lower than GND, the protection diode clamps the port
to a diode drop below GND.
Each of the I/O ports P0–P7 also has a 40k
(typ)
pullup resistor that can be enabled or disabled. When a
port input is driven to a voltage higher than V+, the
body diode of the pullup enable switch conducts and
the 40k
pullup resistor is enabled. When the
MAX7325 is powered down (V+ = 0V), each I/O port
appears as a 40k
resistor in series with a diode con-
nected to 0V. Input ports are protected to +6V under
any of these circumstances (Figure 11).
Driving LED Loads
When driving LEDs from one of the outputs, a resistor
must be fitted in series with the LED to limit the LED
current to no more than 20mA. Connect the LED cath-
ode to the MAX7325 port, and the LED anode to V+
through the series current-limiting resistor, RLED. Set
the port output low to illuminate the LED. Choose the
resistor value according to the following formula:
RLED = (VSUPPLY - VLED - VOL) / ILED
where:
RLED is the resistance of the resistor in series with the
LED (
).
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 MAX7325 when
sinking ILED (V).
ILED is the desired operating current of the LED (A).
For example, to operate a 2.2V red LED at 10mA from a
+5V supply:
RLED = (5 - 2.2 - 0.1) / 0.01 = 270
Driving Load Currents Higher than 20mA
The MAX7325 can be used to drive loads, such as relays
that draw more than 20mA, by paralleling outputs. Use at
least one output per 20mA of load current; for example, a
5V 330mW relay draws 66mA, and therefore, requires
four paralleled outputs. Any combination of outputs can
be used as part of a load-sharing design because any
combination of ports can be set or cleared at the same
time by writing to the MAX7325. Do not exceed a total
sink current of 100mA for the device.
The MAX7325 must be protected from the negative-
voltage transient generated when switching off induc-
tive loads (such as relays), by connecting a
reverse-biased diode across the inductive load.
Choose the peak current for the diode to be greater
than the inductive load’s operating current.
Power-Supply Considerations
The MAX7325 operates with a supply voltage of +1.71V
to +5.5V. Bypass the supply to GND with a ceramic
capacitor of at least 0.047F as close as possible to the
device. For the TQFN version, additionally connect the
exposed pad to GND.
P0–P7
PULLUP
ENABLE
INPUT
OUTPUT
40k
MAX7325
V+
Figure 11. MAX7325 Open-Drain I/O Port Structure
OUTPUT
V+
GND
V+
O8–O15
MAX7325
Figure 10. MAX7325 Push-Pull Output Port Structure
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7325ATG+ | 功能描述:接口-I/O擴(kuò)展器 I2C Port Expander w/8 P-P Out & 8 I/O 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 |
| MAX7325ATG+T | 功能描述:接口-I/O擴(kuò)展器 I2C Port Expander w/8 P-P Out & 8 I/O 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 |
| MAX7325ATG-T | 功能描述:接口-I/O擴(kuò)展器 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 |
| MAX7325EVCMAXQU+ | 功能描述:界面開發(fā)工具 MAX7325 Eval Kit RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| MAX7325EVKIT+ | 功能描述:界面開發(fā)工具 MAX7325 Eval Kit RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
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