MAX1368ECM+ Maxim Integrated Products, MAX1368ECM+ Datasheet - Page 16

• Manufacturer Part Number: MAX1368ECM+
• Description: IC PANEL METER 3.5 DIG 48LQFP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1368ECM+

• Display Type: LED
• Configuration: 7 Segment
• Interface: Serial
• Digits Or Characters: A/D 3.5 Digits
• Voltage - Supply: 2.7 V ~ 5.25 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Supply: -

Microcontroller-Interface, 4.5-/3.5-Digit Panel
Meters with 4–20mA Output
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 20–23
V/I converter.
Note: The MAX1366/MAX1368 expect a 6kΩ (typ)
source impedance from the voltage source driving
CONV_IN.
Set EN_I high for a current span of 4–20mA. Set EN_I
low for a current span of 0 to 16mA. See
current output.
Set EN_BPM low to engage unipolar operation. In unipo-
lar 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
16
Figure 6. ADC and DAC Timing Diagram
Figure 7. Serial-Interface, 16-Bit, Write Timing Diagram
DOUT
SCLK
DIN
______________________________________________________________________________________
CS
CS OR CS_DAC
for current output. See
DOUT
SCLK
DIN
1
for the transfer functions of the DAC and
0
RS4 RS3 RS2 RS1
t
CSH
CONTROL BYTE
Figures
t
DV
t
CSS
t
DS
RS0
t
DH
21
Unipolar Mode
Current Offset
x
and
D15 D14 D13 D12 D11 D10
Table 5
22.
for
t
CH
Table 4. LED During Overrange and
Underrange Conditions
Set EN_BPM high to engage bipolar operation. In bipo-
lar mode, the current output at 4-20OUT (4–20mA or 0
to 16mA) maps the analog input voltage (±2V or
±200mV). In bipolar mode, a 0V analog input maps to
midscale (12mA). See
see
CONDITION
Underrange
Overrange
Figures
D9
DATA BYTE
D8
21
D7
and 22.
D6
MAX1368
-1---
1---
D5
t
DO
D4
Table 5
D3
D2
for current output. Also
D1
t
CSH
MAX1366
D0
-1----
1----
Bipolar Mode
t
TR