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參數(shù)資料
| 型號(hào)： | MAX7329AWE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 9/13頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC I/O EXPANDER I2C 8B 16SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 接口： | I²C |
| 輸入/輸出數(shù)： | 8 |
| 中斷輸出： | 是 |
| 頻率 - 時(shí)鐘： | 100kHz |
| 電源電壓： | 2.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC W |
| 包裝： | 帶卷 (TR) |
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Detailed Description
Functional Overview
The MAX7328/MAX7329 are general-purpose port
expanders operating from a 2.5V to 5.5V supply that
provide eight open-drain input/output ports with a
20mA sink capability. The devices are rated to sink up
to 100mA at once, from any combination of ports. The
port outputs can drive loads connected to any voltage
up to the MAX7328/MAX7329’s supply voltage.
The MAX7328 is set to one of eight I2C slave addresses
0x20 to 0x27, and the MAX7329 is set to one of eight
I2C slave addresses, 0x38 to 0x3F, using the address
inputs AD2, AD1, and AD0. The parts are accessed
over an I2C serial interface up to 100kHz.
Any port can be configured as a logic input by setting the
port output logic-high. The MAX7328/MAX7329 do not
distinguish between a port used as an input and a port
used as an output that happens to be high. When a
MAX7328 or MAX7329 is read through the serial inter-
face, the actual logic levels at the port pins are read back.
When an I/O port is high, an internal pullup to V+ is active.
The pullup is enabled only when the output is high, and is
turned off when the output is low to reduce quiescent cur-
rent. An additional strong pullup to V+ allows fast-rising
edges into heavily loaded outputs. These strong pullups
turn on when an output is written high, and are switched
off by the falling edge of SCL (Figure 2).
The MAX7328/MAX7329 provide an open-drain output
(INT). An interrupt is generated by any rising or falling
edge of the port inputs in the input mode. After time, tIV,
the signal INT is valid.
Resetting and reactivating the interrupt circuit is
achieved when data on the port is changed to the origi-
nal setting or data is read from or written to the port that
generated the interrupt.
Resetting occurs as follows:
In the READ mode at the acknowledge bit after the
rising edge of the SCL signal
In the WRITE mode at the acknowledge bit after the
HIGH-to-LOW transition of the SCL signal
MAX7328/MAX7329
I2C Port Expanders with Eight I/O Ports
_______________________________________________________________________________________
5
Table 1. MAX7328 Slave ID Address Selection
PIN CONNECTION
DEVICE ADDRESS
PORTS POWER-UP DEFAULT
AD2
AD1
AD0
A6
A5
A4
A3
A2
A1
A0
P7
P6
P5
P4
P3
P2
P1
P0
GND
01
000
0
01111111
1
GND
V+
01
000
0
11111111
1
GND
V+
GND
01
000
1
01111111
1
GND
V+
01
000
1
11111111
1
V+
GND
01
001
0
01111111
1
V+
GND
V+
01
001
0
11111111
1
V+
GND
01
001
1
01111111
1
V+
01
001
1
11111111
1
PIN CONNECTION
DEVICE ADDRESS
PORTS POWER-UP DEFAULT
AD2
AD1
AD0
A6
A5
A4
A3
A2
A1
A0
P7
P6
P5
P4
P3
P2
P1
P0
GND
01
110
0
011111111
GND
V+
01
110
0
111111111
GND
V+
GND
01
110
1
011111111
GND
V+
01
110
1
111111111
V+
GND
01
111
0
011111111
V+
GND
V+
01
111
0
111111111
V+
GND
01
111
1
011111111
V+
01
111
1
111111111
Table 2. MAX7329 Slave ID Address Selection
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