Owner's manual

MAX1365/MAX1367
Stand-Alone, 4.5-/3.5-Digit Panel Meters
with 4–20mA Output
10 ______________________________________________________________________________________
PIN NAME FUNCTION
26 HOLD
Hold Logic Input. Connect HOLD to DV
DD
to hold the current ADC value on the LED. Connect
HOLD to GND to update the LED at a rate of 2.5Hz and disable the hold function. Placing the
device into hold mode initiates an offset mismatch calibration. Assert HOLD high for a minimum of
2s to ensure the completion of offset mismatch calibration (see Table 1).
27 DPSET2
Display Decimal-Point Logic-Input 2. Controls the decimal point of the LED. See the Decimal-Point
Control section.
28 DPSET1
Display Decimal-Point Logic-Input 1. Controls the decimal point of the LED. See the Decimal-Point
Control section.
29 LEDG LED Segment-Drivers Ground
30 DIG0 Digit 0 Driver Out (Connected to GLED for the MAX1367)
31 DIG1 Digit 1 Driver Out
32 DIG2 Digit 2 Driver Out
33 DIG3 Digit 3 Driver Out
34 DIG4 Digit 4 Driver Out
35 SEGA Segment A Driver
36 SEGB Segment B Driver
37 LEDV
LED-Display Segment-Driver Supply. Connect to a +2.7V to +5.25V supply. Bypass with a 0.1µF
capacitor to LEDG.
38 SEGC Segment C Driver
39 SEGD Segment D Driver
40 SEGE Segment E Driver
41 SEGF Segment F Driver
42 SEGG Segment G Driver
43 SEGDP Segment DP Driver
44 LED_EN
Active-High LED Enable. The MAX1365/MAX1367 display driver turns off when LED_EN is low.
The MAX1365/MAX1367 LED-display driver turns on when LED_EN is high.
45 NEGV -2.5V Charge-Pump Voltage Output. Connect a 0.1µF capacitor to GND.
46 DPON
Decimal-Point Enable Input. Controls the decimal point of the LED. See the Decimal-Point Control
section. Connect DPON to DV
DD
to enable the decimal point.
47 REF-
ADC Negative Reference Voltage Input. For internal reference operation, connect REF- to GND.
For external reference operation, bypass REF- to GND with a 0.1µF capacitor and
set V
REF-
from -2.2V to +2.2V (V
REF+
> V
REF-
).
48 REF+
ADC Positive Reference Voltage Input. For internal reference operation, connect a 4.7µF capacitor
from REF+ to GND. For external reference operation, bypass REF+ to GND with a 0.1µF capacitor
and set V
REF+
from -2.2V to +2.2V (V
REF+
> V
REF-
).
Pin Description (continued)