參數(shù)資料
型號： DS1856B-M50+T&R
廠商： Maxim Integrated Products
文件頁數(shù)： 2/31頁
文件大?。?/td> 0K
描述： IC RES TEMP-CTRL 50/50K 16CSBGA
產(chǎn)品培訓(xùn)模塊： Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
接片： 256
電阻（歐姆）： 50k
電路數(shù)： 2
溫度系數(shù)： 標(biāo)準(zhǔn)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(yīng)商設(shè)備封裝： 16-CSBGA（4x4）
包裝： 帶卷 (TR)
Dual, Temperature-Controlled Resistors with Inter-
nally Calibrated Monitors and Password Protection
10
Maxim Integrated
DS1856
Monitored Signals
Each signal (VCC, MON1, MON2, MON3, and tempera-
ture) is available as a 16-bit value with 12-bit accuracy
(left-justified) over the serial bus. See Table 1 for signal
scales and Table 2 for signal format. The four LSBs
should be masked when calculating the value. The 3
LSBs are internally masked with 0s.
The signals are updated every frame rate (tframe) in a
round-robin fashion.
The comparison of all five signals with the high and low
user-defined values are done automatically. The corre-
sponding flags are set to 1 within a specified time of
the occurrence of an out-of-limit condition.
Calculating Signal Values
The LSB = 100V for VCC, and the LSB = 38.147V for
the MON signals when using factory default settings.
To calculate VCC, convert the unsigned 16-bit value to
decimal and multiply by 100V.
To calculate MON1, MON2, or MON3, convert the
unsigned 16-bit value to decimal and multiply by
38.147V.
To calculate the temperature, treat the two’s comple-
ment value binary number as an unsigned binary num-
ber, then convert to decimal and divide by 256. If the
result is greater than or equal to 128, subtract 256 from
the result.
Temperature: high byte: -128
°C to +127°C signed; low
byte: 1/256
°C.
SIGNAL
+FS
SIGNAL
+FS
(hex)
-FS
SIGNAL
-FS
(hex)
Temperature +127.984
°
7FFC
-128
°C
8000
VCC
6.5528V
FFF8
0V
0000
MON1
2.4997V
FFF8
0V
0000
MON2
2.4997V
FFF8
0V
0000
MON3
2.4997V
FFF8
0V
0000
Table 1. Scales for Monitor Channels at
Factory Setting
SIGNAL
FORMAT
VCC
Unsigned
MON1
Unsigned
MON2
Unsigned
MON3
Unsigned
Temperature
Two’s complement
Table 2. Signal Comparison
TEMPERATURE
(°C)
CORRESPONDING LOOK-UP
TABLE ADDRESS
<-40
80h
-40
80h
-38
81h
-36
82h
-34
83h
——
+98
C5h
+100
C6h
+102
C7h
>+102
C7h
Table 3. Look-Up Table Address for
Corresponding Temperature Values
MSB
215
214
213
212
211
210
29
28
LSB
27
26
25
24
23
22
21
20
MSB (BIN)
LSB (BIN)
VOLTAGE (V)
10000000
3.29
11000000
11111000
4.94
S26
25
24
23
22
21
20
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
MSB (BIN)
LSB (BIN)
TEMPERATURE (
°C)
01000000
00000000
+64
01000000
00001111
+64.059
01011111
00000000
+95
11110110
00000000
-10
11011000
00000000
-40
MSB (BIN)
LSB (BIN)
VOLTAGE (V)
11000000
00000000
1.875
10000000
1.255
Monitor/VCC Bit Weights
Temperature Bit Weights
Monitor Conversion Example
VCC Conversion Examples
Temperature Conversion Examples
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