DS1858E-050 Maxim Integrated Products, DS1858E-050 Datasheet - Page 9

• Manufacturer Part Number: DS1858E-050
• Description: IC RES TEMP 50/50K 3MON 16-TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of DS1858E-050

• Taps: 256
• Resistance (ohms): 50K
• Number Of Circuits: 2
• Temperature Coefficient: 50 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 95°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Resistance In Ohms: 50K
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Each signal (V
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 signals are updated every frame rate (t
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.
The LSB = 100µV for V
the MON signals.
To calculate the value of V
bit value to decimal and multiply by 100µV.
Table 1. Scales for Monitor Channels
Table 2. Signal Comparison
Monitor/V
V
Temperature
MSB
LSB
CC
SIGNAL
MON1
MON2
MON3
V
MSB (BIN)
10000000
11000000
CC
Conversion Examples
2
2
Temperature
15
7
SIGNAL
MON1
MON2
MON3
V
CC
CC
127.996°C
2
2
CC
SIGNAL
14
6
6.55V
2.5V
2.5V
2.5V
+FS
, MON1, MON2, MON3, and tempera-
Bit Weights
2
2
13
5
CC
LSB (BIN)
10000000
11111000
, and the LSB = 38.147µV for
2
2
(hex)
CC
7FFF
FFFF
FFFF
FFFF
FFFF
+FS
12
4
Calculating Signal Values
, convert the unsigned 16-
2
2
11
3
Two’s complement
Monitored Signals
SIGNAL
-128°C
-FS
Unsigned
Unsigned
Unsigned
Unsigned
0V
0V
0V
0V
FORMAT
_____________________________________________________________________
2
2
10
2
VOLTAGE (V)
Resistors with Three Monitors
3.29
4.94
2
2
frame
9
1
Dual Temperature-Controlled
(hex)
8000
0000
0000
0000
0000
-FS
) in a
2
2
8
0
To calculate the value of MON1, MON2, or MON3 con-
vert the unsigned 16-bit value to decimal and multiply
by 38.147µV.
To calculate the value of the temperature, treat the
two’s complement value binary number as an unsigned
binary number, then convert to decimal and divide by
256. If the result is greater than or equal to 128, then
subtract 256 from the result.
Temperature: high byte: -128°C to +127°C signed; low
byte: 1/256°C.
Table 3. Look-up Table Address for
Corresponding Temperature Values
Monitor Conversion Example
Temperature Bit Weights
Temperature Conversion Examples
S
2
-1
TEMPERATURE
MSB (BIN)
MSB (BIN)
01000000
01000000
01011111
11110110
11011000
11000000
10000000
>+102°C
+100°C
+102°C
<-40°C
+98°C
2
2
-40°C
-38°C
-36°C
-34°C
6
-2
—
2
2
5
-3
LSB (BIN)
00000000
00001111
00000000
00000000
00000000
2
2
LSB (BIN)
00000000
10000000
4
-4
CORRESPONDING LOOK-UP
2
2
3
-5
TABLE ADDRESS
TEMPERATURE (°C)
2
2
2
-6
C5h
C6h
C7h
C7h
80h
80h
81h
82h
83h
—
VOLTAGE (V)
64.059
2
2
1.875
1.255
-10
-40
1
-7
64
95
2
2
0
-8
9