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參數(shù)資料
型號(hào)： PCA9501D,112
廠商： NXP Semiconductors
文件頁(yè)數(shù)： 28/28頁(yè)
文件大?。?/td> 0K
描述： IC I/O EXPANDER I2C 8B 20SOIC
標(biāo)準(zhǔn)包裝： 38
接口： I²C，SM 總線
輸入/輸出數(shù)： 8
中斷輸出： 是
頻率 - 時(shí)鐘： 400kHz
電源電壓： 2.5 V ~ 3.6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 20-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 20-SO
包裝： 管件
包括： EEPROM
配用： 568-4002-ND - DEMO BOARD I2C
其它名稱： 568-3353-5
935272364112
PCA9501D
PCA9501_4
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 04 — 10 February 2009
9 of 28
NXP Semiconductors
PCA9501
8-bit I2C-bus and SMBus I/O port with interrupt, 2-kbit EEPROM
7.4.1.2
Page write
A page write is initiated in the same way as the byte write, if after sending the rst word of
data the STOP condition is not received, the PCA9501 considers subsequent words as
data. After each data word the PCA9501 responds with an acknowledge and the four least
signicant bits of the memory address eld are incremented. Should the master not send
a STOP condition after 16 data words, the address counter will return to its initial value
and overwrite the data previously written. After the receipt of the STOP condition the
inputs will behave as with the byte write during the internal write cycle.
7.4.2 Read operations
PCA9501 read operations are initiated in an identical manner to write operations with the
exception that the memory slave address R/W bit is set to ‘1’. There are three types of
read operations: current address read, random read and sequential read.
7.4.2.1
Current address read
The PCA9501 contains an internal address counter that increments after each read or
write access and as a result, if the last word accessed was at address ‘n’ then the address
counter contains the address ‘n + 1’.
When the PCA9501 receives its memory slave address with the R/W bit set to one it
issues an acknowledge and uses the next eight clocks to transmit the data contained at
the address stored in the address counter. The master ceases the transmission by issuing
the STOP condition after the eighth bit. There is no ninth clock cycle for the acknowledge.
Fig 12. Byte write
0
A
S
slave address (memory)
START condition
R/W
acknowledge
from slave
002aad296
word address
SDA
A5 A4 A3 A2 A1 A0
1
P
STOP condition.
Write to the memory
is performed.
A
acknowledge
from slave
data
A
acknowledge
from slave
Fig 13. Page write
0
A
S
slave address (memory)
START condition
R/W
acknowledge
from slave
002aad297
word address
SDA
A5 A4 A3 A2 A1 A0
1
P
STOP condition.
Write to the memory is performed.
A
acknowledge
from slave
data to memory
A
acknowledge
from slave
DATA n
data to memory
A
acknowledge
from slave
DATA n + 3
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