ES51932
22,000 Counts Auto DMM
1.9 Temperature measurement mode
Temperature measurement mode takes input signal from ADP pin and reference voltage
from (VA+ - VA-). ES51932 has a built-in ℃-to-℉ scale translation circuit, and only
needs an external ℃ scale application circuit. The application circuit for ℉ scale is
not required. In temperature measurement mode, the default range is 2200.0 ℃ or ℉.
The VBAR pin is used to control the second decimal point (DP2) on the LCD panel.
When VBAR is LOW, DP2 is turned on and the first decimal point (DP1) is turned off.
And the range becomes 220.00℃ and ℉.
1.10 Auto power off and Idle Time selection
ES51932 has a default auto power off function. If the meter is idle for more than the
given idle time, the chip automatically turns the power off. The idle time to trigger the
auto power off function is determined by pin ‘APOSEL’. If pin APOSEL is connected
to V-, the idle time will be set to 30 minutes. If pin APOSEL is connected to DGND or
kept floating, the idle time will be set to 15 minutes. When APO happens, the state of
the meter is saved. The APO symbol on the LCD panel indicates whether the auto
power off is enabled or not. In some cases, user might want to disable Auto power off.
There are two ways to disable this feature as following:
1. Power on the meter when any of the push functions, except for HOLD is pressed
down.
2. In addition, when RS232 output is active, the auto power off function is also
disabled.
Note:
Power on the meter while pressing HOLD and lasts 1 seconds turns on all LCD segments until HOLD is
pressed again.
1.11 Sleep
The meter enters sleep mode after auto power off. The SLEEP pin asserts low (-3V) in
the sleep mode, and asserts high (+3V, not 0V) after re-power on.
1.12 Re-power on
After auto power-off, pushing any of the push function or changing the rotary mode can
turn on the meter again. If the meter is re-powered on by changing the rotary mode, the
saved state is cleared. If the meter is re-powered on by push functions, the chip restores
the saved state and enters HOLD mode. The LCD displays the saved value.
Ver. 1.2
12
10/05/27
CYRUSTEK [ Cyrustek corporation ]
