DS1859E-050+T&R Maxim Integrated Products, DS1859E-050+T&R Datasheet - Page 10

• Manufacturer Part Number: DS1859E-050+T&R
• Description: IC RES TEMP 50/50K 3MON 16-TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of DS1859E-050+T&R

• 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: 2.85 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: Lead free / RoHS 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.
For the 20k
with 0s.
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 when using factory default settings.
Dual, Temperature-Controlled Resistors with
Internally Calibrated Monitors
Table 1. Scales for Monitor Channels at
Factory Setting
Table 2. Signal Comparison
Monitor/V
V
10
Temperature
MSB
LSB
CC
SIGNAL
MSB (BIN)
MON1
MON2
MON3
10000000
11000000
V
CC
____________________________________________________________________
Conversion Examples
Temperature
2
2
15
SIGNAL
7
MON1
MON2
MON3
V
CC
CC
version, the 3 LSBs are internally masked
127.984 C
CC
SIGNAL
6.5528V
2.4997V
2.4997V
2.4997V
2
2
14
6
+FS
, MON1, MON2, MON3, and tempera-
Bit Weights
2
2
13
LSB (BIN)
10000000
11111000
5
CC
, and the LSB = 38.147µV for
(hex)
7FFC
FFF8
FFF8
FFF8
FFF8
+FS
2
2
Calculating Signal Values
12
4
Monitored Signals
2
Two’s complement
2
11
3
SIGNAL
-128 C
-FS
Unsigned
Unsigned
Unsigned
Unsigned
FORMAT
0V
0V
0V
0V
VOLTAGE (V)
2
2
10
2
3.29
4.94
frame
2
2
9
1
(hex)
8000
0000
0000
0000
0000
-FS
) in a
2
2
8
0
To calculate V
decimal and multiply by 100µV.
To calculate MON1, MON2, or MON3, convert the
unsigned 16-bit value to decimal and multiply by
38.147µV.
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.
Table 3. Look-up Table Address for
Corresponding Temperature Values
Monitor Conversion Example
Temperature Bit Weights
Temperature Conversion Examples
TEMPERATURE
2
MSB (BIN)
MSB (BIN)
S
-1
01000000
01000000
01011111
11110110
11011000
11000000
10000000
>+102
+100
+102
<-40
(°C)
+98
-40
-38
-36
-34
—
2
2
-2
6
CC
2
2
, convert the unsigned 16-bit value to
-3
5
LSB (BIN)
00000000
00001111
00000000
00000000
00000000
LSB (BIN)
00000000
10000000
2
2
-4
CORRESPONDING LOOK-UP
4
TABLE ADDRESS
2
2
-5
3
TEMPERATURE ( C)
C5h
C6h
C7h
C7h
80h
80h
81h
82h
83h
—
2
2
-6
2
VOLTAGE (V)
64.059
1.875
1.255
-10
-40
64
95
2
2
-7
1
2
2
-8
0