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參數(shù)資料
| 型號： | DS3503U+T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 3/13頁 |
| 文件大小： | 0K |
| 描述： | IC POT DGTL NV 128TAP 10-MSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 接片： | 128 |
| 電阻（歐姆）： | 5k |
| 電路數(shù)： | 2 |
| 溫度系數(shù)： | 標(biāo)準(zhǔn)值 4 ppm/°C |
| 存儲器類型： | 非易失 |
| 接口： | I²C（設(shè)備位址） |
| 電源電壓： | 2.7 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 100°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-µMAX |
| 包裝： | 帶卷 (TR) |
DS3503
NV, I2C, Stepper Potentiometer
______________________________________________________________________________________
11
Reading a single byte from a slave: Unlike the write
operation that uses the specified memory address byte
to define where the data is to be written, the read opera-
tion occurs at the present value of the memory address
counter. To read a single byte from the slave, the master
generates a START condition, writes the slave address
byte with R/W = 1, reads the data byte with a NACK to
indicate the end of the transfer, and generates a STOP
condition. However, because requiring the master to
keep track of the memory address counter is impracti-
cal, the following method should be used to perform
reads from a specified memory location.
Manipulating the address counter for reads: A dummy
write cycle can be used to force the address counter to a
particular value. To do this the master generates a
START condition, writes the slave address byte (R/W =
0), writes the memory address where it desires to read,
generates a repeated START condition, writes the slave
address byte (R/W = 1), reads data with ACK or NACK
as applicable, and generates a STOP condition.
See Figure 3 for a read example using the repeated
START condition to specify the starting memory location.
Applications Information
Power-Supply Decoupling
To achieve the best results when using the DS3503,
decouple both the power-supply pin (VCC) and the
wiper-bias voltage pin (V+) with a 0.01F or 0.1F
capacitor. Use a high-quality ceramic surface-mount
capacitor if possible. Surface-mount components mini-
mize lead inductance, which improves performance,
and ceramic capacitors tend to have adequate high-
frequency response for decoupling applications.
SDA and SCL Pullup Resistors
SDA is an I/O with an open-collector output that
requires a pullup resistor to realize high-logic levels. A
master using either an open-collector output with a
pullup resistor or a push-pull output driver must be
used for SCL. Pullup resistor values should be chosen
to ensure that the rise and fall times listed in the
I2C AC
Electrical Characteristics are within specification. A typ-
ical value for the pullup resistors is 4.7k
Ω.
SLAVE
ADDRESS
START
0
1
0
1
0
R/W
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
MSB
LSB
MSB
LSB
MSB
LSB
b7
b6
b5
b4
b3
b2
b1
b0
READ/
WRITE
REGISTER ADDRESS
b7
b6
b5
b4
b3
b2
b1
b0
DATA
STOP
SINGLE-BYTE WRITE
-WRITE STEP CONTROL
REGISTER (SCR) TO 1Fh
SINGLE-BYTE READ
-READ CONTROL REGISTER (CR)
START
REPEATED
START
51h
MASTER
NACK
STOP
01010000
00000 010
02h
01010 001
01010000
00000 001
00011111
50h
01h
1Fh
STOP
DATA
EXAMPLE I2C TRANSACTIONS
TYPICAL I2C WRITE TRANSACTION
50h
A)
B)
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
SLAVE
ACK
Figure 3. I2C Communication Examples
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