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參數(shù)資料
| 型號： | DS1856B-M50+ |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 19/31頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DGTL POT 50K 256TAPS 16CSBGA |
| 產品培訓模塊： | Obsolescence Mitigation Program |
| 標準包裝： | 100 |
| 接片： | 256 |
| 電阻（歐姆）： | 50k |
| 電路數(shù)： | 2 |
| 溫度系數(shù)： | 標準值 50 ppm/°C |
| 存儲器類型： | 非易失 |
| 接口： | 2 線串口 |
| 電源電壓： | 2.85 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 95°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-LBGA，CSPBGA |
| 供應商設備封裝： | 16-CSBGA（4x4） |
| 包裝： | 托盤 |
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Dual, Temperature-Controlled Resistors with Inter-
nally Calibrated Monitors and Password Protection
26
Maxim Integrated
DS1856
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 tframe. 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
_Re
=
1
4
OUTPUT RANGE USED
WITH ZERO RIGHT-SHIFTS
NUMBER OF
RIGHT-SHIFTS NEEDED
0h....FFFFh
0
0h....7FFFh
1
0h....3FFFh
2
0h....1FFFh
3
0h....0FFFh
4
Table 9. Right Shifting
M6
M5
M4
M3
M2
M1
2
4
6
8
10
12
TEMPERATURE (
°C)
MEMORY
LOCATION
INCREASING
TEMPERATURE
DECREASING
TEMPERATURE
Figure 4. Look-Up Table Hysteresis
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS1856B-M50/T | 制造商:Maxim Integrated Products 功能描述:- Tape and Reel |
| DS1856B-M50/T&R | 制造商:Maxim Integrated Products 功能描述:DUALTEMP 50K,3MON BGA FULL A0/A2M T - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC DGTL POT 50K 2CH 16CSBGA 制造商:Maxim Integrated Products 功能描述:Digital Potentiometer ICs Extremely Acc SPI Bus RTC |
| DS1856B-M50+ | 功能描述:數(shù)字電位計 IC DUALTEMP 50K3MON W/FULL AO/A2 MEMORY 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 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS1856B-M50+R | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Dual, Temperature-Controlled Resistors with Calibrated Monitors and Password Protection |
| DS1856B-M50+T | 制造商:Maxim Integrated Products 功能描述:DUALTEMP 50K,3MON BGA W/FULL AO/A2 MEMORY - Tape and Reel |
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