ES278 Datasheet, PDF (7/25 Pages) Cyrustek corporation – 4000 Counts Manual DMM

Function Description
1. Operating Modes
ES278
4000 Counts Manual DMM
1.1. Voltage Measurement
A re-configurable voltage divider provides a manual range in voltage measurement mode. The
400.0mV range is independent and manual mode. It takes input signal from mVin (pin22). The other
ranges take the input signal from VR1 (pin21). The following table summarizes the Full-Scale ranges
in each configuration.
Configuration
VR1
VR2
VR3
VR4
VR5
Full Scale Range
400.0mV
4.000V
40.00V
400.0V
1000V
Divider Ratio
1
1/10
1/100
1/1000
1/10000
Resister Connection
-
VR2 (1.111MΩ)
VR3 (101KΩ)
VR4 (10.01KΩ)
VR5 (1KΩ)
Input Pin
mVin V.S. SGND
VR1 V.S. SGND
VR1 V.S. SGND
VR1 V.S. SGND
VR1 V.S. SGND
The ES278 support the hazardous live voltage warning. When the voltage measured exceeds the
30V, the buzzer generates 2KHz beep and ALARM (pin38) drive high output (V+ level)
periodically. It can remind the user to notice the hazardous voltage. The buzzer sound warning
could be cancelled by DISDGBP (pin41).
1.1.1. OL Selection
ES278 has a voltage OL selection feature archived by configuring the pin CESEL (pin40). In
1000V voltage mode, ES278 will show OL when the voltage is exceed the overflow level. If CESEL
is connected to DGND, ES278 will have a 1010V overflow level in voltage mode. If CESEL
connected to V-, the overflow level will be set to 610V in DCV and ACV mode. The configuration of
CESEL is listed below.
For ACV/DCV voltage modes:
DCV
ACV
V-
610V
610V
CESEL
DGND
1010V
1010V
Floating
1010V
760V
V 1.5
7
2015/12/11