MAX1367 Maxim Integrated Products, MAX1367 Datasheet - Page 14

• Manufacturer Part Number: MAX1367
• Description: (MAX1365 / MAX1367) Digit Panel Meters
• Manufacturer: Maxim Integrated Products

The MAX1365/MAX1367 feature a 4–20mA (0 to 16mA)
current output for driving remote panel meters, data log-
gers, and process controllers in industrial applications.
The DAC output is proportional to the input of the ADC
and LED display. In the simplest configuration, connect
DAC_VOUT directly to CONV_IN to have the current out-
put (4–20mA or 0 to 16mA) follow the analog inputs.
Custom signal conditioning can be inserted between
DAC_VOUT and CONV_IN, or CONV_IN can be driven
independently by a voltage source if desired. See
Figures 11–14 for the transfer functions of the DAC and
V/I converter.
Note: The MAX1365/MAX1367 expect a 6kΩ (typ)
source impedance from the external voltage source
driving CONV_IN.
Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 4–20mA Output
Figure 4. 2-Digit Common-Cathode Configuration
Figure 5. LED Voltage Waveform
14
______________________________________________________________________________________
DIGIT 4 (MSD)
DIGIT 0 (LSD)
DIGIT 3
DIGIT 2
DIGIT 1
SEGDP
SEGG
SEGF
SEGE
SEGD
SEGC
SEGB
SEGA
DATA
Current Output
A
MSD
T
ON
4
B
3
C
F
E
INTERDIGIT BLANKING TIME
DIGIT 1
D
T
2
G
D
A
E
B
C
1
F
DP
LSD
0
G
DP
4
Set EN_I high for a current span of 4–20mA. Set EN_I low
for a current span of 0 to 16mA. See Table 5 for current
output.
Set EN_BPM low to engage unipolar operation. In
unipolar mode, the current output at 4-20OUT (4–20mA
or 0 to 16mA) maps the analog input voltage (0 to 2V or
0 to 200mV). Negative voltages at the analog input
result in a 4mA or 0mA output, depending on the EN_I
setting. See Table 5 for current output. See Figures 12
and 13.
3
A
B
2
C
E
F
1
DIGIT 2
D
A
G
D
0
E
C
B
F
DP
4
G
DP
Unipolar Mode
Current Offset