DMM Analog front end/Insulation
Features
•
60000 counts dual-slope SADC (2 cnvs/s.)
•
Input signal full scale: 630mV (Max. 63000 count)
•
Built-in 600 counts fast speed (x10) FADC
•
Fast ADC conversion rate: 20 times/s
•
100L LQFP package
•
3V DC regulated power supply
•
Support digital multi-meter function
*Voltage measurement (AC/DC)
*Current measurement (AC/DC)
*Dual mode for frequency with voltage or current
*Resistance measurement (600.00Ω – 60.000MΩ)
*Conductance measurement (60.00nS)
*Capacitance measurement (6.000nF – 60.00mF)
(Taiwan patent no.: 323347, 453443)
*Diode or continuity mode measurement
*Frequency counter with duty cycle display:
60.000Hz – 60.000MHz
5.0% – 95.0%
•
ADP mode (AC or DC mode is available)
•
3dB BW selectable for low pass filter at AC mode
(Taiwan
patent no.: 362409)
(China
patent no.: 1363073)
•
Band-gap reference voltage output
•
Peak-hold measurement
(Taiwan
patent no.:476418)
•
3-wire serial bus for MPU I/O port
•
MPU I/O power level selectable by external pins
•
On-chip buzzer driver and frequency selectable by
MPU command
•
High-crest-factor signal detection
(Taiwan
patent no.: 234661)
•
Multi-level battery voltage detection
•
Support sleep mode by external chip select pin
ES51998(60000counts)
Description
ES51998 is an analog frond end chip of
DMM built-in 60000(SADC)/600(FADC)
counts dual ADCs. The SADC is operated at
slower speed for higher resolution. The
FADC is operated at higher speed for lower
resolution. ES51998 provides voltage &
current (AC/DC) measurement, resistance
measurement, capacitance measurement,
diode/continuity measurement, frequency
measurement, duty cycle measurement and
voltage peak-hold function. An analog
switches network is built-in for insulation
resistance application. The ES51998 also
supports multi-level battery detection,
low-pass-filter feature for AC mode and dual
mode measurement for V+F & A+F. A 3-wire
serial bus for MPU I/O port will be used
easily for firmware design. Flexible function
design is supported for different kinds of
DMM or Clamp-on meter application.
.
Application
Clamp-on meter
Digital multi-meter
ver 1.7
1
12/01/12
DMM Analog front end/Insulation
ES51998(60000counts)
Pin Assignment
1
2
3
4
5
6
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
CIH
CH-
CH+
AGND
AGND
DGND
V+
V+
uPVCC
V-
V-
LBAT
C-
C+
SDATA
SCLK
DATA_new
NC
BZOUT
IO_CTRL
CS
OSC1
OSC2
NC
NC
D
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
D
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
C
B
A
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
OVX
OVH
OVH1
IRR5
IRR4
IRR3
IRR2
IRR1
IRVG
IRVL
SGND
IVSH
IVSL
ADP
OPIN-
OPIN+
OPOUT
ACVL
ACVH
ADI
ADO
TEST5
CA-
CA+
OHMC4
BU
FH
CA
ZH
NC
CL
+
CL
-
CIL
CA
ZL
BU
FL
RA
Z
OH
MC3
OH
MC2
OH
MC1
VR
H
VA
+
VA
-
EX
TSRC
IRV
H1
IRV
H0
OR
1
VR
5
VR
4
VR
3
VR
2
OV
SG
VR
1
ES51998
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
FRE
Q
STB
EEP
CPKIN
PM
AX
PM
IN
LPFOUT
LPC3
LPC2
LPC1
R1K
R9K
NC
NC
NC
NC
C
B
A
1
2
3
4
5
6
ver. 1.7
2
12/01/12
DMM Analog front end/Insulation
Pin Description
Pin No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
ver. 1.7
Symbol
BUFH
CAZH
NC
CL+
CL-
CIL
CAZL
BUFL
RAZ
OHMC3
OHMC2
OHMC1
VRH
VA+
VA-
EXTSRC
IRVH1
IRVH0
OR1
VR5
VR4
VR3
VR2
OVSG
VR1
OVX
OVH
OVH1
IRR5
IRR4
IRR3
IRR2
IRR1
IRVG
IRVL
SGND
IVSH
IVSL
ADP
OPIN-
OPIN+
OPOUT
ACVL
ACVH
ADI
ADO
TEST5
CA-
Type
O
O
-
IO
IO
O
O
O
O
O
O
O
O
I
I
I
O
O
O
O
O
O
O
O
I
I
O
O
I
I
I
I
I
I
I
G
I
I
I
I
I
O
O
O
I
O
O
IO
Description
High-speed buffer output pin. Connect to integral resistor.
High-speed auto-zero capacitor connection.
Not connected
Positive connection for reference capacitor of high-resolution A/D.
Negative connection for reference capacitor of high- resolution A/D.
High-resolution integrator output. Connect to integral capacitor.
High-resolution auto-zero capacitor connection.
High-resolution Buffer output pin. Connect to integral resistor
Buffer output pin in AZ and ZI phase.
Filter capacitor connection for resistance mode.
Filter capacitor connection for resistance mode.
Filter capacitor connection for resistance mode.
Output of band-gap voltage reference. Typically –1.23V
De-integrating voltage positive input. The input should be higher than
VA-.
De-integrating voltage negative input. The input should be lower than
VA+.
External source input available for Res/Diode/ADP mode
High voltage measurement range1 for insulation R mode
High voltage measurement range0 for insulation R mode
Reference resistor connection for 600.00Ω range
Voltage measurement ÷10000 attenuator(1000.0V)
Voltage measurement ÷1000 attenuator(600.00V)
Voltage measurement ÷100 attenuator(60.000V)
Voltage measurement ÷10 attenuator(6.0000V)
Sense low voltage for resistance/voltage measurement
Measurement Input. Connect to a precise 10MΩ resistor.
Sense input for resistance/capacitance measurement
Output connection for resistance measurement
Output connection1 for resistance measurement (optional)
Test mode used (optional)
Current shunt resistor4 connection for insulation R mode
Current shunt resistor3 connection for insulation R mode
Current shunt resistor2 connection for insulation R mode
Current shunt resistor1 connection for insulation R mode
Voltage measurement terminal low-side of shunt resistor
Voltage measurement terminal high-side of shunt resistor
Signal Ground.
Current measurement input for 6000.0μA, 600.00mA and 60.000A
modes.
Current measurement input for 600.00μA, 60.000mA.
Measurement input in ADP mode.
Independent operational amplifier negative input
Independent operational amplifier positive input
Independent operational amplifier output
DC signal low input in ACV/ACA mode. Connect to negative output
of external AC to DC converter.
DC signal high input in ACV/ACA mode. Connect to positive output
of external AC to DC converter.
Negative input of internal AC-to-DC OPAMP.
Output of internal AC-to-DC OPAMP.
Buffer output of OVSG
Negative auto-zero capacitor connection for capacitor measurement
3
12/01/12
ES51998(60000counts)
DMM Analog front end/Insulation
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66-77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
CA+
OHMC4
NC
NC
NC
NC
R9K
R1K
LPC1
LPC2
LPC3
LPFOUT
PMIN
PMAX
CPKIN
STBEEP
FREQ
NC
OSC2
OSC1
CS
IO_CTRL
BZOUT
NC
DATA_NEW
SCLK
SDATA
C+
C-
LBAT
V-
V-
uPVCC
V+
V+
DGND
AGND
AGND
CH+
CH-
CIH
IO
O
-
-
-
-
O
O
O
O
O
O
O
O
I
O
I
-
O
I
I
I
I
-
O
I
IO
O
O
I
P
P
P
O
O
G
G
G
IO
IO
O
Positive auto-zero capacitor connection for capacitor measurement
Filter capacitor connection for resistance mode.
Not connected
Not connected
Not connected
Not connected
Connect to a precise 9KΩ resister for capacitor measurement.
Connect to a precise 1KΩ resister for capacitor measurement.
Capacitor C1 connection for internal low-pass filter
Capacitor C2 connection for internal low-pass filter
Capacitor C3 connection for internal low-pass filter
Capacitor C1 connection for internal low-pass filter
Minimum peak hold output
Maximum peak hold output.
Bypass capacitor for peak mode
Fast low-impedance sensed output for CONT./Diode mode Build-in a
internal comparator for OVX pin.
Frequency counter input, offset V-/2 internally by the chip.
Not connected
Crystal oscillator output connection
Crystal oscillator input connection
Set to high to enable ES51998. Set to low to enter sleep mode
MPU I/O level LOW setting. Connect to DGND or V-.
Buzzer frequency output. Normal low state.
Not connected
New ADC data ready
Serial clock input
Serial data input/output
Positive capacitor connection for on-chip DC-DC converter.
Negative capacitor connection for on-chip DC-DC converter.
Low battery configuration input.
Negative supply voltage.
Negative supply voltage.
Switch 5 for function selection.
Output of on-chip DC-DC converter.
Output of on-chip DC-DC converter.
Digital ground.
Analog ground.
Analog ground.
Positive connection for reference capacitor of high-speed A/D.
Negative connection for reference capacitor of high-speed A/D.
High-speed integrator output. Connect to integral capacitor.
ES51998(60000counts)
ver. 1.7
4
12/01/12
DMM Analog front end/Insulation
Absolute Maximum Ratings
Characteristic
Supply Voltage (V- to AGND)
Analog Input Voltage & EXTSRC pin
V+
AGND/DGND
Digital Input (IO_CTRL=V-)
Power Dissipation. Flat Package
Operating Temperature
Storage Temperature
-4V
V- -0.6 to V+ +0.6
V+
≥
(AGND/DGND+0.5V)
AGND/DGND
≥
(V- -0.5V)
V- -0.6 to uPVCC+0.6
500mW
0℃ to 70℃
-55℃ to 125℃
Rating
ES51998(60000counts)
Electrical Characteristics
TA=25℃, V- = -3.0V
Parameter
Power supply
Operating supply current
In DCV mode
SADC
2
Voltage roll-over error
FADC
3
Voltage roll-over error
SADC
2
voltage nonlinearity
FADC
3
voltage nonlinearity
Voltage full scale range of SADC
2
Voltage full scale range of FADC
3
Input Leakage for VR1 input
Zero input reading
Band-gap reference voltage
Open circuit voltage for 600Ω range
measurement
Open circuit voltage for other Ω
measurement
Open circuit voltage for 60.00nS
range measurement
Internal pull-high to 0V
current
AC frequency response at 6.000V
range
OP unity gain bandwidth
OP slew rate at unity gain
OP input offset voltage
OP input bias current
OP input common mode
voltage range
ver. 1.7
GB
SR
V
IO
I
B
V
ICR
5
NLV1
NLV2
Symbol
Test Condition
V-
I
DD
Normal operation
I
SS
In sleep mode
10MΩ input resistor
10MΩ input resistor
Best case straight
line
Best case straight
line
VA+-VA- = 200mV
VA+-VA- = 200mV
10MΩ input resistor
100KΩ resistor
between VRH and
AGND
Min.
-2.8
—
—
—
—
—
—
—
—
-10
-000
-1.30
—
—
—
Between V- pin and
CS
±1%
±5%
C
L
=10pF
R
L
=10MΩ
—
—
—
—
—
—
—
—
Typ.
-3.0
2.8
1
—
—
—
—
600
600
1
000
-1.22
V-
V
RH
-0.68
1.2
40-400
400-2000
200
3.5
0.1
10
+2
Max
-3.2
3.2
3
±0.01
±0.5
±0.01
±1.0
630
—
10
+000
-1.14
—
—
—
—
—
—
—
—
—
—
—
Units
V
mA
µA
%F.S
1
%F.S
1
%F.S
1
%F.S
1
mV
mV
pA
Count
V
V
V
V
µA
HZ
kHz
V/us
mV
pA
V
12/01/12
V
RH
Analog electronics
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