P-1
特性
将I2C信号输入,将数据线性转换成4-20mA/0-20mA的模拟电流输出。
输入信号范围15Bit,0x0000-0x7FFF
输入I2C信号高电平:2.7V- 5.5V
3bit I2C硬件地址位
输出电流线性度误差 0.01%
电源电压:9V -36V
功耗:VCC
1M
22u
1M
0.5p
15Ω
RL
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
负载
FN1601-74.1 — Data Sheet
GP8212ASL
DAC (Digital to Analog Converter)
15bitDAC I2C to 4-20mA/0-20mA
P-4
3. 典型应用
3.2 操作方法
3.2.1 Start、Stop条件、有效数据、数据变换格式
SCL
SDA
Start 条件
Stop 条件
有效数据 数据变换
3.2.2 ACK格式
Start
Condition
SCL
Data In
Data Out
ACK
3.2.3如下图设置地址0x02,将15bit DATA数据分为DATA Low和DATA High写入,DATA Low 为低Byte,
DATA High为高Byte,输出相对应的电流为: IOUT=1.25V/RS*DATA/0xFFF。I2C命令中,包含3bit硬件地
址位,可以实现8片GP8212ASL芯片的并接使用
S
T
A
R
T
SDA 数据
DATA Low
1 0 1 1
A AA
DDDD DDDD
0 A0 0 0 0 0 01 0 A
A
2 1 0
7 6 5 4 3 2 1 0
AM
A
L A
CS
C
SC
KB
K
BK
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
S
T
O
P
DATA High
D D D D D
0 1 1 1 1 1
4 3 2 1 0
DD
A
9 8
L A
SC
BK
FN1601-74.1 — Data Sheet
GP8212ASL
DAC (Digital to Analog Converter)
15bitDAC I2C to 4-20mA/0-20mA
P-5
3. 典型应用
3.2 操作方法
3.2.4 GP8212ASL支持将电压数据保存在芯片内,保证掉电启动后依旧能处于相应的电压输出状态。
通过发送下图所示数据,可以实现写入的数据固化到芯片内部。
S
T
A
R
T
SDA 数据
S
ST
T A
OR
PT
0 1 0
S
T
O
P
0 0 0 1 0 00 0 A0 0 0 0 0 01 1 A
A
C
K
S
T
A
R
T
A
C
K
DATA6
DATA1
DATA0
0 0 0 0 0 00 0 1
1 0 1 1 0 00 0 1 0 0 0 0 0 00 0 1 0 0 0 0 0 00 0 1 0 0 0 0 0 00 0 1
M
S
B
S
T
A
R
T
等待7ms以上
L
S
B
M
S
B
L
S
B
M
S
B
S
ST
T A
OR
PT
0 1 0
S
T
O
P
0 0 0 1 0 00 0 A0 0 0 0 0 00 0 A
A
C
K
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
S
T
O
P
A
C
K
L
S
B
FN1601-74.1 — Data Sheet
GP8212ASL
DAC (Digital to Analog Converter)
15bitDAC I2C to 4-20mA/0-20mA
4. 功能说明
GP8212ASL是一款高性能DAC芯片,数字量以I2C协议信号的方式输入到芯片中。通过在FB进行反馈采样,实
现闭环的电流输出,并根据需求接入负载电阻,通常选择低温漂的50欧姆电阻,便可以通过IOUT输出 0-25mA
电流。
电流大小为:IOUT=1.25V/RS * (DATA/0x7FFF)
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1601-74.1 — Data Sheet
P-6
GP8212ASL
DAC (Digital to Analog Converter)
15bitDAC I2C to 4-20mA/0-20mA
P-7
5. 交流特性
符号
fsclk
描述
最小
默认
I2C时钟频率
最大
单位
400K
Hz
6. 直流特性
符号
描述
VCC
电源电压
ICC
电源功耗
IOUT
输出电流
ΔIOUT*1
输出电流误差
Lout
输出电流线性度
Tco
温飘系数
RL*2
负载电阻
测试条件
最小
默认
最大
单位
9
24
36
V
0.7
1
mA
25
mA
0.5
%
VCC @24V 空载
0
与IOUT输出范围的比例
0.01
0.01
VCC@24V
*1:初始输出电流精度0.5%,经过两点校准,可以实现0.01%的精度。
*2:此负载最大值指的是值外扩2SD882三极管的情况。
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
%
50
PPM/℃
800
Ω
FN1601-74.1 — Data Sheet
GP8212ASL
DAC (Digital to Analog Converter)
15bitDAC I2C to 4-20mA/0-20mA
P-8
7. 订购须知
GP 8 2 12ASL - X
- XX
产品类型
8:PAC/DAC
9:APC
温度范围
W:-40°C-85°C
输入信号
1:PWM
2:I2C
系列号
封装
E:ESOP10
温度系数
TC50:50PPM/℃
TC25:25PPM/℃
封装
工作温度
电源
温度系数
订购码
ESOP10
-40℃-85℃
9V-36V
50PPM
GP8212ASL-TC50-EW
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1601-74.1 — Data Sheet
GP8212ASL
DAC (Digital to Analog Converter)
15bitDAC I2C to 4-20mA/0-20mA
8. 封装信息
ESOP10
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Linearin and designs are registered trademarks of Linearin Technology Corporation.
© Copyright Linearin Technology Corporation. All Rights Reserved.
All other trademarks mentioned are the property of their respective owners.
FN1601-74.1 — Data Sheet
P-9
GP8212ASL
DAC (Digital to Analog Converter)
15bitDAC I2C to 4-20mA/0-20mA
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