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参数资料
| 型号： | DS1859E-020+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/28页 |
| 文件大小： | 0K |
| 描述： | IC RES TEMP 20/20K 3MON 16-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 接片： | 256 |
| 电阻（欧姆）： | 20k |
| 电路数： | 2 |
| 温度系数： | 标准值 50 ppm/°C |
| 存储器类型： | 非易失 |
| 接口： | I²C（设备位址） |
| 电源电压： | 2.85 V ~ 5.5 V |
| 工作温度： | -40°C ~ 95°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
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DS1859
Dual, Temperature-Controlled Resistors with
Internally Calibrated Monitors
22
____________________________________________________________________
Programming the Look-up Table (LUT)
The following equation can be used to determine which
resistor position setting, 00h to FFh, should be written in
the LUT to achieve a given resistance at a specific tem-
perature.
α = 3.852357 for the 20k resistor
α = 4.5680475 for the 50k resistor
R = the resistance desired at the output terminal
C = temperature in degrees Celsius
u, v, w, x1, x0, y, and z are calculated values found in the
corresponding look-up tables. The variable x from the
equation above is separated into x1 (the MSB of x) and x0
(the LSB of x). Their addresses and LSB values are given
below. Resistor 0 variables are found in Table 1, and
Resistor 1 variables are found in Table 2.
When shipped from the factory, all other memory loca-
tions in the LUTs are programmed to FFh.
Table 8. Calibration Constants
Internal Calibration
The DS1859 has two methods for scaling an analog
input to a digital result. The two methods are gain and
offset. Each of the inputs (VCC, MON1, MON2, and
MON3) has a unique register for the gain and the offset
found in Table 01h, 92h to 99h, and A2h to A9h.
To scale the gain and offset of the converter for a spe-
cific input, you must first know the relationship between
the analog input and the expected digital result. The
input that would produce a digital result of all zeros is
the null value (normally this input is GND). The input
that would produce a digital result of all ones is the full-
scale (FS) value. The FS value is also found by multiply-
ing an all-ones digital answer by the weighted LSB
(e.g., since the digital reading is a 16-bit register, let us
assume that the LSB of the lowest weighted bit is
50V, then the FS value is 65,535 x 50V = 3.27675V).
A binary search is used to scale the gain of the con-
verter. This requires forcing two known voltages to the
input pin. It is preferred that one of the forced voltages
is the null input and the other is 90% of FS. Since the
LSB of the least significant bit in the digital reading reg-
ister is known, the expected digital results are also
known for both inputs (null/LSB = CNT1 and 90%FS/
LSB = CNT2).
The user might not directly force a voltage on the input.
Instead they have a circuit that transforms light, fre-
quency, power, or current to a voltage that is the input
to the DS1859. In this situation, the user does not need
to know the relationship of voltage to expected digital
result but instead knows the relationship of light, fre-
quency, power, or current to the expected digital result.
pos
R C
Ru
v
C
w
C
xy
C
z
C
α,
α
,
()=
+
()+
()
() +
()+
()
125
25
125
25
2
M6
M5
M4
M3
M2
M1
24
6
8
10
12
TEMPERATURE (
°C)
MEMORY
LOCATION
INCREASING
TEMPERATURE
DECREASING
TEMPERATURE
Figure 4. Look-Up Table Hysteresis
ADDRESS (Hex)
VARIABLE
LSB
F8
u
20
F9
v
20E-6
FA
w
100E-9
FB
x1
21
FC
x0
2-7
FD
y
2E-6 (signed)
FE
z
10E-9
FF
Reserved
—
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1859E-050 | 功能描述:数字电位计 IC RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
| DS1859E-050/R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors |
| DS1859E-050/T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors |
| DS1859E-050/T&R | 制造商:Maxim Integrated Products 功能描述:DUAL TEMP R 50/50K,3MON,TSSOP T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC RES TEMP 50/50K 3MON 16-TSSOP |
| DS1859E-050/T&R | 功能描述:数字电位计 IC RoHS:否 制造商:Maxim Integrated 电阻:200 Ohms 温度系数:35 PPM / C 容差:25 % POT 数量:Dual 每 POT 分接头:256 弧刷存储器:Volatile 缓冲刷: 数字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作电源电压:1.7 V to 5.5 V 电源电流:27 uA 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:TQFN-16 封装:Reel |
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