ADT7518
Rev. A | Page 20 of 40
BIAS
DIODE
INTERNAL
SENSE
TRANSISTOR
V
DD
TO ADC
V
OUT+
V
OUT
I
N ?/SPAN> I
I
BIAS
Figure 42. Top Level Structure of Internal Temperature Sensor
Table 7. Thermal Voltage Output (0 V to 2 VREF)
O/P Voltage (V)
Default 癈
Max 癈
Sample 癈
0
40
128
0
0.25
26
114
+14
0.5
+12
100
+28
0.75
+3
85
+43
1
+17
71
+57
1.12
+23
65
+63
1.47
+43
45
+83
1.5
+45
43
+85
2
+73
15
+113
2.25
+88
0
+127
2.5
+102
+14
UDB*
2.75
+116
+28
UDB*
3
UDB*
+42
UDB*
3.25
UDB*
+56
UDB*
3.5
UDB*
+70
UDB*
3.75
UDB*
+85
UDB*
4
UDB*
+99
UDB*
4.25
UDB*
+113
UDB*
4.5
UDB*
+127
UDB*
* Upper deadband has been reached. DAC output is not capable of increasing.
See Figure 9.
Negative temperatures:
( )
128
0
Re
+
=
Temp
V
d
Code
gister
Offset
where:
D7 of Offset Register Code is set to 1 for negative temperatures.
Example:
( )
58h
d
88
128
40
d
Re
=
=
+
=
Code
gister
Offset
Since a negative temperature has been inserted into the
equation, DB7 (MSB) of the offset register code is set to 1.
Therefore 58h becomes D8h.
58h + DB7(1) = D8h
Positive temperatures:
Offset Register Code (d) = 0 V Temp
Example:
Offset Register Code (d) = 10d = 0Ah
The following equation is used to work out the various
temperatures for the corresponding 8-bit DAC output:
Temp
V
LSB
P
O
DAC
Temp
Bit
-
0
1
/
8
+
For example, if the output is 1.5 V, VREF-IN = 2.25 V, 8-bit DAC
has an LSB size = 2.25 V/256 = 8.79 x 10
3
, and 0 V temperature
is at 128癈, then the resultant temperature is
(
)
C
?/DIV>
+
=
+
?/DIV>
?/DIV>
43
128
10
79
.
8
5
.
1
3
Figure 43 shows a graph of the DAC output versus temperature
for a VREF-IN = 2.25 V.
TEMPERATURE (?/SPAN>C)
0
0.15
128110 90 70 50 30 10 10 30 50 70 90 110 127
0.30
0.45
0.60
0.75
0.90
1.05
1.20
1.35
1.50
1.65
1.80
1.95
2.10
2.25
0V = 128?/SPAN>C
0V = 40?/SPAN>C
0V = 0?/SPAN>C
Figure 43. DAC Output vs. Temperature V
REF
-IN = 2.25 V
FUNCTIONAL DESCRIPTIONANALOG INPUTS
Single-Ended Inputs
The ADT7518 offers four single-ended analog input channels.
The analog input range is from 0 V to 2.25 V, or 0 V to VDD. To
maintain the linearity specification, it is recommended that the
maximum VDD value be set at 5 V. Selection between the two
input ranges is done by Bit C4 of the Control Configuration 3
register (Address 1Ah). Setting this bit to 0 sets up the analog
input ADC reference to be sourced from the internal voltage
reference of 2.25 V. Setting the bit to 1 sets up the ADC
reference to be sourced from VDD.
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
AT30TS00-MAH-T
SENSOR DGTL TEMP I2C/SMBUS 8WDFN
AT30TSE002B-MAH-T
SENSOR DGTL TEMP I2C/SMBUS 8WDFN
BD3504FVM-TR
IC REG CTRLR SGL POS ADJ 8MSOP
BD3521FVM-TR
IC REG CTRLR SGL 1.5V MSOP8
BD9153MUV-E2
IC REG TRPL BCK/LINEAR 24VQFN
CAT2300VP2-GT3
IC SENSE FET CONTROLLER 8TDFN
CAT34TS02VP2GT4A
IC TEMP SENSOR 2K MEMORY 8TDFN
CAT6095VP2-GT4
IC TEMP SENSOR STAND ALONE 8TDFN
相关代理商/技术参数
ADT7518ARQZ-REEL
制造商:Analog Devices 功能描述:Temp Sensor Analog Serial (4-Wire, SPI, I2C) 16-Pin QSOP T/R
ADT7518ARQZ-REEL7
制造商:Analog Devices 功能描述:Temp Sensor Analog Serial (4-Wire, SPI, I2C) 16-Pin QSOP T/R
ADT7519
制造商:AD 制造商全称:Analog Devices 功能描述:SPI-/I2C-Compatible, Temperature Sensor,4-Channel ADC and Quad Voltage Output
ADT7519ARQ
制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (4-Wire, SPI, I2C) 16-Pin QSOP
ADT7519ARQ-REEL
制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (4-Wire, SPI, I2C) 16-Pin QSOP T/R
ADT7519ARQ-REEL7
制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (4-Wire, SPI, I2C) 16-Pin QSOP T/R 制造商:Analog Devices 功能描述:TEMP SENSOR DGTL SERL (4-WIRE, SPI) 16QSOP - Tape and Reel
ADT7519ARQZ
功能描述:IC TEMP SNSR QUAD DAC 16-QSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:3,000 系列:- 功能:温度开关 传感器类型:内部 感应温度:85°C 分界点 精确度:±6°C（最小值） 拓扑:ADC（三角积分型），比较器，寄存器库 输出类型:开路漏极 输出警报:是 输出风扇:是 电源电压:2.7 V ~ 5.5 V 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称:ADT6501SRJZP085RL7-ND
ADT7519ARQZ1
制造商:AD 制造商全称:Analog Devices 功能描述:SPI/I2C Compatible, Temperature Sensor, Four Channel ADC and Quad Voltage Output DAC