ES51998 [CYRUSTEK]

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