DS1856E-050 Maxim Integrated Products, DS1856E-050 Datasheet - Page 10

• Manufacturer Part Number: DS1856E-050
• Description: Digital Potentiometer ICs
• Manufacturer: Maxim Integrated Products

Specifications of DS1856E-050

• Number Of Pots: Dual
• Taps Per Pot: 256
• Resistance: 50 KOhms
• Wiper Memory: Non Volatile
• Digital Interface: Serial (2-Wire)
• Operating Supply Voltage: 3.3 V, 5 V
• Supply Current: 2 mA
• Maximum Operating Temperature: + 95 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.85 V
• Package / Case: TSSOP-16
• 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. The 3
LSBs are internally masked 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 Inter-
nally Calibrated Monitors and Password Protection
Table 1. Scales for Monitor Channels at
Factory Setting
Table 2. Signal Comparison
10
Monitor/V
V
Temperature +127.984
MSB
LSB
CC
SIGNAL
MON1
MON2
MON3
V
MSB (BIN)
10000000
11000000
CC
____________________________________________________________________
Conversion Examples
Temperature
2
2
15
7
SIGNAL
MON1
MON2
MON3
V
CC
CC
2
CC
SIGNAL
2
6.5528V
2.4997V
2.4997V
2.4997V
14
6
+FS
, MON1, MON2, MON3, and tempera-
Bit Weights
2
2
13
5
CC
LSB (BIN)
10000000
11111000
, and the LSB = 38.147µV for
(hex)
7FFC
2
FFF8
FFF8
FFF8
FFF8
+FS
2
12
Calculating Signal Values
4
Monitored Signals
2
2
Two’s complement
11
3
SIGNAL
-128 C
-FS
Unsigned
Unsigned
Unsigned
Unsigned
FORMAT
0V
0V
0V
0V
2
2
10
VOLTAGE (V)
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
S
MSB (BIN)
-1
01000000
01000000
01011111
11110110
11011000
MSB (BIN)
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
2
LSB (BIN)
00000000
10000000
2
CORRESPONDING LOOK-UP
-4
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
+64
+95
-10
-40
1.875
1.255
2
2
-7
1
2
2
-8
0