CYRTK ES51984 Datasheet

ES51984

3 3/4 CAP AUTO DMM

Features

• 4000 count display

• Full automatic measurement

*Voltage measurement

*Current measurement

*Resistor measurement

• Capacitor measurement (Auto range: 4n

to 4mF)

• 40MHz Frequency counter

• Range change function

• Data hold function

Description

ES51984 is an integrated analog-to-digital

Converter(ADC) with 4000 counts LCD

display ,automatic range selection, and 3V

DC power supply. Automatic range

selection is provided for voltage(AC/DC)

measurement, resistor measurement,

current measurement, capacitor

measurement, frequency counter.

Expensive and bulky mechanical range

switches are not required. Other features

include data holding, diode measurement,

temperature measurement, continuity

checking, low battery detection, auto-

power off, re-power on, and RS232 data

output.

• Diode measurement

• ADP mode with external reference

voltage

• Serial data output (RS232 format)

• Auto power off (10 mins) and re-power

on

• Low battery detect (3V and 9V)

• 3V DC power supply

• Back light function

Application

Digital Multimeter

03/01/16

1

Pin Assignment

AGND

AGND

DGND

V-

V-

LBAT9

SDO

NC

ES51984

3 3/4 CAP AUTO DMM

SLACDC

RANGE

HOLD

KEY

FC5

FC4

FC3

FC2

FC1

NC

C+

C-

90100

1

80

+
+

+

-

10

20

70

60

30

VA +

ADP

VA -

SGND

03/01/16

NC

VR1

VBAR

R9K

R1K

CA-

40

CA+

2

SLEEP

FREQNCRS232

BKLIT

SEG16

50

SEG13

SEG14

SEG15

Pin Description

ES51984

3 3/4 CAP AUTO DMM

Pin No Symbol Type

1
2 V+ P Positive supply voltage, output of on-chip DC-DC converter.
3 V+ P Positive supply voltage, output of on-chip DC-DC converter.
4NC
5 CL+ IO High resolution positive connection for reference capacitor.
6 CL- IO High resolution negative connection for reference capacitor.
7 CIL O High resolution integrator output. Connected to integral capacitor
8 CAZL O High resolution auto-zero capacitor connection.

9 BUFL O Integral resistor connection for high resolution buffer output
10 IVSH I High current measurement input.
11 IVSL I Low current measurement input
12 OVX I Input high voltage for resistance measurement
13 OVH I Output connection for resistance measurement
14 OVSG I Sense low voltage for resistance measurement
15 NC
16 OR1 O Reference resistor connection for 399.9Ω range
17 VR5 O Voltage measurement ÷10000 attenuator(4000V)
18 VR4 O Voltage measurement ÷1000 attenuator(400.0V)
19 VR3 O Voltage measurement ÷100 attenuator(40.00V)
20 VR2 O Voltage measurement ÷10 attenuator(4.000V)
21 TEST 5 I/O Test pin
22 ACVL O Negative output of AC to DC converter
23 ACVH O Positive output of AC to DC converter.
24 NC
25 ADI I Negative input of internal AC to DC Opamp.
26 NC
27 ADO O Output of internal AC to DC Opamp.
28 NC
29 VRH O Output of band-gap voltage reference .Typically –1.2V
30 VR I Reference input voltage connection. Typically –100mV
31 VA+ I For ADP. Deintegrating voltage positive input. The input should

32 VA- For ADP. Deintegrating voltage negative input. The input should

33 ADP I ADP input
34 SGND G Signal Ground
35 VR1 I Measurement input
36 NC
37 VBAR I In capacitance mode, a compensation capacitance is connected

38 R9K O Connect to a 9KΩ resister for capacitor measurement.
39 R1K O Connect to a 1KΩ resister for capacitor measurement.
40 CA- IO Negative auto-zero capacitor connection for capacitor measurement
41 CA+ IO Positive auto-zero capacitor connection for capacitor measurement
42 SLEEP O Asserts low in the sleep mode. See page 9, function description
43 FREQ I Frequency counter input, offset V-/2 internally by the chip.
44 NC
45 RS232 I Pulse low to enable serial data output.
46 BKLIT I Back light function. Pulse low to set BKOUT pin output

47~50

NC

SEG16~SEG13

be higher than VA-.

be lower than VA+.

In temperature mode, it is used to control decimal point. See page

O LCD segment line 16~13

Description

03/01/16

3

.

ES51984

3 3/4 CAP AUTO DMM

Continued on next page…….
…continued from previous page

51
52

53~64

65 BP4 O LCD backplane 4
66 BP3 O LCD backplane 3
67 BP2 O LCD backplane 2
68 BP1 O LCD backplane 1
69 ANNUNC O Square wave output at the backplane frequency, synchronized to

70 NC
71 BUZIN I Enables the buzzer. Low active.

72 BUZOUT O Outputs an 2KHz audio frequency signal for driving piezoelectric

73 NC
74 OSC2 O Crystal oscillator output connection
75 OSC1 I Crystal oscillator input connection
76 NC
77 XTAL I The chip uses internal RC oscillator if pin is connected to V-, and

78 NC
79 BKOUT O If BKLIT function is enabled, this pin will change from –3V to +3V

80 NC
81 HOLD I Pulse low to enable HOLD mode.
82 RANGE I Pulse low to enable manual mode and manual range selection.
83 SLACDC I Select AC/DC initial state. This pin is pull low
84 KEY I Pulse low to change mode. In ADP mode, if this pin is connected to

85 FC5 I Switch 5 for function selection.
86 FC4 I Switch 4 for function selection.
87 FC3 I Switch 3 for function selection.
88 FC2 I Switch 2 for function selection.
89 FC1 I Switch 1 for function selection.
90 NC
91 C+ O Positive capacitor connection for on-chip DC-DC converter.
92 C- O Negative capacitor connection for on-chip DC-DC converter.
93 NC
94 SDO O RS232 compliant serial data output.
95 LBAT9 I Low battery configuration. If 3V battery is used, connect it to AGND

96 V- P Negative supply voltage. Connecting to battery negative terminal.
97 V- P Negative supply voltage. Connecting to battery negative terminal.
98 DGND G Digital ground, connected to battery positive terminal.
99 AGND G Analog ground.

100 AGND G Analog ground.

NC
NC

SEG12~SEG01

O LCD segment line 12~01

BP1. ANNUNC can be used to control display annunciator. Con­nect an LCD segment to ANNUNC to turn it on; connect an LCD
segment to its backplane to turn it off.

buzzer when BUZIN is low.

uses external crystal oscillator if this pin is floating or connected to
DGND

for 60 sec, once press BKLIT pin again within 60 sec, this pin will
change back to –3V.

V-, the buzzer output will be off when the ADP input overflows.

The default low-battery threshold voltage is –2.3V. If 9V battery is
used, the low battery annunciator is displayed when the voltage of
this pin is less than VRH (-1.2V)

03/01/16

4

A

V

A

D

P

n

Absolute Maximum Ratings

Characteristic Rating

Supply Voltage (V- to AGND) -4V

nalog Input Voltage V- -0.6 to V+ +0.6
+

GND/DGND

igital Input V- -0.6 to DGND +0.6

ower Dissipation. Flat Package 500mW

Operating Temperature
Storage Temperature

Electrical Characteristics

ES51984

3 3/4 CAP AUTO DMM

V+

≥ (AGND/DGND+0.5V)

AGND/DGND

0℃ to 70℃

-25℃ to 125℃

≥ (V- -0.5V)

Parameter Symbol Test Condition Min. Typ. Max Units
Power supply V- -3.5 -3.0 -2.2 V

I

In DCV mode

Voltage roll-over error REV

Voltage nonlinearity NLV

Input Leakage -10 1 10 PA
Low battery flag voltage V- to AGND -2.5 -2.3 -2.1 V
Zero input reading 10MΩ input resistor -000 000 +000 counts
Reference voltage and open circuit
voltage for 400Ω measurement V

Peak to peak backplane
drive voltage
Counter time base period f

Open circuit voltage for Ω

measurement (except 400Ω)

Internal pull-high to 0V
current

Internal pull-low to V­current
AC frequency response at

4.000V range

Reference voltage temperature
Coefficient

TC

Normal operation

DD

In sleep mode

I

SS

resistor

Best case straight
line

100KΩ resistor
between VRH and

REF

AGND

-3.5V

OSC

Ω and Continuity
Mode
Between V- pin and

HOLD, RANGE,
KEY, FC1, FC2,
FC3, FC4, FC5,
XTAL, BKLIT
Between V- pin
and RS232
Between GND Pi
and SLACDC
±1%

±5%

100KΩ resister
Between VRH

RF

0℃<TA<70℃

≤ V ≤-2.2V

= 4MHZ

—
—
——

——

-1.3 -1.2 -1.1 V

3.00 3.2 3.40 V

—

-0.54 -0.47 -0.4 V

—

—

—
—

—

TA=2 5℃, V- = -3V

0.9 1.4 mAOperating supply current

2.5 5 µA
±0.1 %F.S10MΩ input

±0.1 %F.S

1

1.2

11

1.5 µA

40-400

40-2000

50

—

—

—

—
—

— ppm/℃

sec

µA

HZ

03/01/16

5

Capacitance
Measurement accuracy

Note:

1. Full Scale

Function Description

1. Operating Modes

1.1 Voltage Measurement

ES51984

3 3/4 CAP AUTO DMM

-1.5 — 1.5

4nF range

40nF – 4µF

4µF~4mF

-2 — 2

-0.8 — 0.8

-2 — 2

-1.1 — 1.1

-2 — 2

%F.S

counts

%F.S

counts

%F.S

counts

A reconfigurable voltage divider automatically provides a suitable range in voltage

measurement mode. The following table summarizes the full scale ranges in each

configuration.

Configuration Full Scale Range Divider Ratio Resister Connection

VR1 400.0mV 1 ­VR2 4.000V 1/10 R2 / (R1+R2)
VR3 40.00V 1/100 R3 / (R1+R3)
VR3 400.0V 1/1000 R4 / (R1+R4)
VR5 4000V 1/10000 R5 / (R1+R5)

1. 400.0 mV range only exists in manual mode.

2. In the 4000V range, if the digit number is larger than 1000V, LCD will display

“OL”.

The measurement of true RMS using ES636

If ES636 (or other true RMS-to-DC converter chip) is used for true RMS measurement,

the suggested application circuit is shown in Figure 1. When ES636 is used for true

RMS, ADO and ADI pin short together, TEST5 pin keeps floating, and ACVL pin

connects to SGND.

03/01/16

6

Cav

ES51984

3 3/4 CAP AUTO DMM

OVSG

100

OR1

1K

VR5

10K

VR4

101K

1.11M

VR3
VR2

14

13

ES636

12

11

10

9

8

+Vs

150

470K

+Vs

-Vs

ACVL

ACVH

ADI

ADO

500K

200

-Vs

1

2

3

4

5

6

7

Figre 1. The ture RMS measure using ES636

Resistance Measurement

A reconfigurable divider automatically provides a suitable full scale range in resistance

measurement mode. The following table summarizes the full scale ranges and the

reference resistors in each configuration.

Configuration Full Scale Range Divider Ratio Resister Connection

OR1 400.0Ω R6 100Ω
OR2 4.000KΩ R5 1KΩ
OR3 40.00KΩ R4 10KΩ
OR4 400.0KΩ

OR5 4.000MΩ
OR6 40.00MΩ R1 10MΩ

R1
R1

‖
‖

R3

R2

100KΩ

1MΩ

1.2 Current measurement

Current measurement has three modes. The following table summarizes the full scale

range of each mode.

Mode Range Selection Full Scale

Automatic Mode 1
Automatic Mode 2 mA 40.00mA / 400.0mA

Automatic Mode 3 A 40.00A / 4.000A

Manual Mode A 40.00A

03/01/16

µA

7

400.0µA / 4000µA