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參數(shù)資料
| 型號(hào)： | MAX7319ATE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC I/O EXPANDER I2C 8B 16TQFN-EP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 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： | 16-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 16-TQFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
MAX7319
Slave Address
The MAX7319 has a 7-bit slave address (Figure 5). The
8th bit following the 7-bit slave address is the R/W bit. It
is low for a write command, and high for a read com-
mand.
The 1st (A6), 2nd (A5), and 3rd (A4) bits of the MAX7319
slave address are always 1, 1, and 0. Connect AD2 and
AD0 to GND, V+, SDA, or SCL to select slave address
bits A3, A2, A1, and A0. The MAX7319 has 16 possible
slave addresses (Table 3), allowing up to 16 MAX7319
devices on an I2C bus
Accessing the MAX7319
I2C-interface access to the MAX7319 is summarized as
follows (Table 2).
A single-byte read from the MAX7319 returns the sta-
tus of the eight input ports, and clears both the internal
transition flags and the INT output (Figure 7).
A 2-byte read returns the status of the eight input ports
(as for a single-byte read), followed by the transition
flags. The internal transition flags and the INT output
are cleared when the MAX7319 acknowledges the
slave address byte, but the previous transition flag data
is sent as the second byte (Figure 8).
A multibyte read (more than 2 bytes before the I2C
STOP bit) repeatedly returns the input port data, alter-
nating with the transition flags. As the input data is
resampled for each transmission, and the transition
flags are reset each time, a multibyte read continuously
returns the current data and identifies any changing
input ports.
If a port input data change occurs during the read
sequence, INT is reasserted after the I2C STOP bit. The
MAX7319 does not generate another interrupt during a
single-byte or multibyte read.
I2C Port Expander with Eight Inputs and
Maskable Transition Detection
10
______________________________________________________________________________________
SDA
SCL
.
11
A3
A2
A1
A0
0
R/W
MSB
LSB
ACK
Figure 5. Slave Address
SCL
MAX7319 SLAVE ADDRESS
S1
1
0
A
P
1
PORT INPUT
tIV
N
I0
I1
I2
I3
I4
I5
I6
I7
D0
D1
D2
D3
D4
D5
D6
D7
PORT INPUTS
INT OUTPUT
R/W
PORT SNAPSHOT
tPH
tIR
PORT SNAPSHOT
tPSU
tIP
INT REMAINS HIGH UNTIL STOP CONDITION
Figure 6. Reading from the MAX7319 (1 Data Byte)
S = START CONDITION
SHADED = SLAVE TRANSMISSION
P = STOP CONDITION
N = NOT ACKNOWLEDGE
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