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參數(shù)資料
| 型號： | MAX7300AAI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 其它接口 |
| 英文描述： | 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, PDSO28 |
| 封裝： | 5.30 MM, MO-150, SSOP-28 |
| 文件頁數(shù)： | 7/22頁 |
| 文件大小： | 348K |
| 代理商： | MAX7300AAI |
M
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port I/O Expander
_______________________________________________________________________________________
7
Serial Interface
Serial Addressing
The MAX7300 operates as a slave that sends and
receives data through an I
2
C-compatible 2-wire inter-
face. The interface uses a serial data line (SDA) and a
serial clock line (SCL) to achieve bidirectional commu-
nication between master(s) and slave(s). A master (typ-
ically a microcontroller) initiates all data transfers to and
from the MAX7300, and generates the SCL clock that
synchronizes the data transfer (Figure 2).
The MAX7300 SDA line operates as both an input and
an open-drain output. A pullup resistor, typically 4.7k
,
is required on SDA. The MAX7300 SCL line operates
only as an input. A pullup resistor, typically 4.7k
, is
required on SCL if there are multiple masters on the 2-
wire interface, or if the master in a single-master system
has an open-drain SCL output.
Each transmission consists of a START condition
(Figure 3) sent by a master, followed by the MAX7300
7-bit slave address plus R/
W
bit (Figure 6), a register
address byte, one or more data bytes, and finally a
STOP condition (Figure 3).
Start and Stop Conditions
Both SCL and SDA remain high when the interface is
not busy. A master signals the beginning of a transmis-
sion with a START (S) condition by transitioning SDA
from high to low while SCL is high. When the master
has finished communicating with the slave, it issues a
STOP (P) condition by transitioning SDA from low to
high while SCL is high. The bus is then free for another
transmission (Figure 3).
Bit Transfer
One data bit is transferred during each clock pulse.
The data on SDA must remain stable while SCL is high
(Figure 4).
Acknowledge
The acknowledge bit is a clocked 9th bit, which the
recipient uses to handshake receipt of each byte of
data (Figure 5). Thus, each byte transferred effectively
requires 9 bits. The master generates the 9th clock
pulse, and the recipient pulls down SDA during the
acknowledge clock pulse, such that the SDA line is sta-
ble low during the high period of the clock pulse. When
the master is transmitting to the MAX7300, the
MAX7300 generates the acknowledge bit since the
Table 1. Port Configuration Map
REGISTER DATA
D4
P6
P10
P14
P18
P22
P26
P30
REGISTER
ADDRESS
CODE (HEX)
D7
D6
D5
D3
D2
D1
D0
Port Configuration for P7, P6, P5, P4
Port Configuration for P11, P10, P9, P8
Port Configuration for P15, P14, P13, P12
Port Configuration for P19, P18, P17, P16
Port Configuration for P23, P22, P21, P20
Port Configuration for P27, P26, P25, P24
Port Configuration for P31, P30, P29, P28
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
P7
P11
P15
P19
P23
P27
P31
P5
P9
P13
P17
P21
P25
P29
P4
P8
P12
P16
P20
P24
P28
Table 2. Port Configuration Matrix
PORT
CONFIGURATION
BIT PAIR
MODE
FUNCTION
PORT
REGISTER
PIN BEHAVIOR
ADDRESS
CODE (HEX)
UPPER
0
LOWER
0
DO NOT USE THIS SETTING
Written Low
Written High
0x09 to 0x0F
Active-low logic output
Active-high logic output
Output
GPIO Output
0x09 to 0x0F
0
1
Input
GPIO Input
without Pullup
GPIO Input with Pullup
Reading Port
Schmitt logic output
0x09 to 0x0F
1
0
Input
Reading Port
Schmitt logic input with pullup
0x09 to 0x0F
1
1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX7300AAI+ | 功能描述:接口-I/O擴(kuò)展器 2.5-5.5V 20/28 Port I/O Expander 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 |
| MAX7300AAI+T | 功能描述:接口-I/O擴(kuò)展器 2.5-5.5V 20/28 Port I/O Expander 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 |
| MAX7300AAI-T | 功能描述:接口-I/O擴(kuò)展器 2.5-5.5V 20/28 Port I/O Expander 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 |
| MAX7300AAX | 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 |
| MAX7300AAX+ | 功能描述:接口-I/O擴(kuò)展器 2.5-5.5V 20/28 Port I/O Expander 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 |
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