參數(shù)資料
型號(hào)： DS1856
廠商： Maxim Integrated Products, Inc.
英文描述： Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection
中文描述： 雙路、溫度控制電阻器，具有內(nèi)部校準(zhǔn)監(jiān)測(cè)器和加密保護(hù)
文件頁(yè)數(shù)： 26/31頁(yè)
文件大小： 484K
代理商： DS1856
D
Dual, Temperature-Controlled Resistors with Inter-
nally Calibrated Monitors and Password Protection
26
____________________________________________________________________
gain_result = gain_result + 2^n;
Force the 90% FS input (2.949075V);
Meas2 = read the digital result from
the part;
If Meas2 >= Clamp then
gain_result = gain_result – 2^n;
Else
Force the null input (0.5V);
Meas1 = read the digital result from
the part;
if (Meas2 – Meas1) > (CNT2 –
CNT1) then
gain_result = gain_result – 2^n;
end;
Set the gain register to gain_result;
The gain register is now set and the resolution of the
conversion will best match the expected LSB. The next
step is to calibrate the offset of the DS1856. With the
correct gain value written to the gain register, again
force the null input to the pin. Read the digital result
from the part (Meas1). The offset value is equal to the
negative value of Meas1.
The calculated offset is now written to the DS1856 and
the gain and offset scaling is now complete.
Right-Shifting A/D Conversion Result
(Scalable Dynamic Ranging)
The right-shifting method is used to regain some of the
lost ADC range of a calibrated system. If a system is cali-
brated so the maximum expected input results in a digi-
tal output value of less than 7FFFh (1/2 FS), then it is a
candidate for using the right-shifting method.
If the maximum desired digital output is less than 7FFFh,
then the calibrated system is using less than 1/2 of the
ADC’s range. Similarly, if the maximum desired digital
output is less than 1FFFh, then the calibrated system is
only using 1/8 of the ADC’s range. For example, if using
a zero for the right-shift during internal calibration and
the maximum expected input results in a maximum digi-
tal output less than 1FFCh, only 1/8 of the ADC’s range is
used. If left like this, the three MS bits of the ADC will
never be used. In this example, a value of 3 for the right-
shifting maximizes the ADC range. No resolution is lost
since this is a 12-bit converter that is left justified. The
value can be right-shifted four times without losing reso-
lution. Table 9 shows when the right-shifting method can
be used.
Temperature Conversion
The direct-to-digital temperature sensor measures tem-
perature through the use of an on-chip temperature
measurement technique with a -40°C to +102°C operat-
ing range. Temperature conversions are initiated upon
power-up, and the most recent conversion is stored in
memory locations 60h and 61h of the Main Device,
which are updated every t
frame
. Temperature conver-
sions do not occur during an active read or write to
memory.
The value of each resistor is determined by the tempera-
ture-addressed look-up table. The look-up table assigns
a unique value to each resistor for every 2°C increment
with a 1°C hysteresis at a temperature transition over the
operating temperature range (see Figure 4).
Offset
gister
Meas
4
_Re
=
1
OUTPUT RANGE USED
WITH ZERO RIGHT-SHIFTS
NUMBER OF
RIGHT-SHIFTS NEEDED
0h....FFFFh
0h....7FFFh
0h....3FFFh
0h....1FFFh
0h....0FFFh
0
1
2
3
4
Table 9. Right Shifting
M6
M5
M4
M3
M2
M1
2
4
6
8
10
12
TEMPERATURE (
°
C)
M
INCREASING
TEMPERATURE
DECREASING
TEMPERATURE
Figure 4. Look-Up Table Hysteresis
相關(guān)PDF資料
PDF描述
DS1856B-002 Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection
DS1856B-002R Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection
DS1856B-002T Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection
DS1856B-020 Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection
DS1856B-020R Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS1856B-002 功能描述:數(shù)字電位計(jì) IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel
DS1856B-002/R 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection
DS1856B-002/T 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection
DS1856B-002/T&R 制造商:Maxim Integrated Products 功能描述:DUAL TEMP 3MON BGA T&R - Tape and Reel
DS1856B-002/T&R 功能描述:數(shù)字電位計(jì) IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲(chǔ)器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel
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