ES51966
4 3/4 and 5 3/4 A/D (Peak &Cap)
Features
External crystal oscillator
4MHz: count up to 44,000 counts
(input range: ±440mV)
10MHz: count up to 440,000 counts
(input range: ±440mV)
Four selectable conversion rates:
20, 10, 5, 2 conversion/sec
On chip resistance switches for range
Changing.
Voltage (DC/AC), current(DC/AC), resistor,
diode, capacitance, frequency and duty cycle
measurement
400mV independent input
on chip OP amp’ for AC/DC conversion
Auto zeroing function
Peak hold function with calibration mode
X10 function
I/O port for microprocessor
Capacitance measurement
-4nF to 40mF, count up to 40,000 counts
-Discharging indication
400MHz Frequency counter and 1MHz duty
cycle measurement
On chip buzzer driving: 2KHz
Single 5V DC power supply (V+ to V-)
Low battery detection
SLEEP mode
Description
The ES51966 is a 44,000/440,000-count
dual-slope analog-to-digital converter
(ADC) with X10 and PEAK Hold
functions. The ES51966 also include
capacitance, frequency and duty cycle
measurement. The conversion rate and
resolution can be selected/decided by
external microprocessor. In additional,
other functions are also provided for low
battery detection, on chip buzzer driving,
and I/O port with microprocessor.
64-pin QFP
1
06/04/25
ES51966
4 3/4 and 5 3/4 A/D (Peak &Cap)
Absolute Maximum Ratings
Characteristic
Positive Supply Voltage
(V+ to AGND)
Negative Supply Voltage
(V- to AGND)
Analog I/O Voltage
Digital I/O Voltage
Power Dissipation
Operating Temperature
Storage Temperature
Lead Temperature
(soldering, 10sec)
Rating
3.5V
-3.5V
((V-) - 0.5V) to ((V+) + 0.5V)
((V-) - 0.5V) to ((V+) + 0.5V)
800mW
0°C to 70°C
-25°C to 125°C
270°C
Electrical Characteristics
TA=25°C, DGND=AGND=0V
Symbol Parameter
Test Condition
V+
V-
I(V+)
I(GND)
Zero
NLV1
REV1
NLV10
REV10
V12
LBATT
Positive Power Supply
Negative Power Supply
Operation
Supply Current
Supply Current of DGND
to V-
Zero Input Reading
Nonlinearity (Voltage x1)
Rollover Error
(Voltage x1)
Nonlinearity
(Voltage x10)
Rollover Error
(Voltage x10)
Band Gap Voltage
Reference
Low Battery Detection
PEAK Hold value accuracy
(10us)
Reference Voltage (V12)
Temperature Coefficient
Normal power on (V+ to V-)
∆V
between DGND and V- is -
0.2V
1 MΩ input resistor, null to zero
by uP.
Best case straight line
1 MΩ input resistor
Best case straight line
1 MΩ input resistor
100 kΩ between V12 and AGND
LBATT to V12
½用
10nF
聚㆚酯薄膜電容
(polyester, Mylar)
100 kΩ between V12 and AGND
(0°C to 70°C)
Min.
2.3
-2.3
-
5
-0
-0.01
-0.01
-0.1
-0.1
-1.31
-60
-1.2
-25
-
Typ. Max. Unit
2.5
-2.5
1.0
10
0
-
-
-
-
-1.23
0
-
50
2.7
-2.7
1.7
-
+0
0.01
0.01
0.1
0.1
-1.10
V
V
mA
mA
count
%F.S.
%F.S.
%F.S.
%F.S.
V
TCRF
60
mV
+1.2 %F.S.
+25
±count
-
ppm/°C
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06/04/25
ES51966
4 3/4 and 5 3/4 A/D (Peak &Cap)
Pin configuration
QFP-64pin
L
B
A
T VV
T + +
A
G
N
D
A
G
N
D
60
O
S
D
C
G
N V V4
D- - M
S
C
L
K
S
T
A
TVE
UC O
S C C
55
50
CAZ
RAZ
BUF
BUFX10
Cref-
Cref+
NC
IVSH
IVSL
TEST5
ACVL
ACVH
ADI
ADO
NC
OVX
OVH
NC
1
CINT
5
45
10
40
15
35
20
25
30
OSC2
OSC1
BUZOUT
BUZIN
NC
FREQ
NC
CA-
CA+
R1K
R9K
CCMP
NC
VR
VRH
NC
PMAX
PMIN
NC
OO V V V V N S N VN V N
VR R R R R C G C R C 4 C
S 1 5 4 3 2
N 1
0
0
G
D
m
ES51966
Pin Description
Pin No.
Symbol
Type Description
O
O
O
O
O
I/O
I/O
I
I
I/O
O
O
I
O
Auto-zero capacitor connection
Auto-zero resistance connection
Integration capacitor connection
Integration resistor connection output
Integration resistor connection output
Negative connection for reference capacitor
Positive connection for reference capacito
High current measurement input
Low current measurement input
Test Pin
Negative output of AC to DC converter
Positive output of AC to DC converter.
Negative input of internal AC to DC OpAmp
Output of internal AC to DC OpAmp.
1
CAZ
2
RAZ
3
CINT
4
BUF
5
BUFX10
6
Cref-
7
Cref+
9
IVSH
10
IVSL
11
TEST5
12
ACVL
13
ACVH
14
ADI
15
ADO
Continued on next page
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06/04/25
ES51966
4 3/4 and 5 3/4 A/D (Peak &Cap)
Pin No.
17
18
20
21
22
23
24
25
27
29
31
34
35
37
38
40
41
42
43
44
46
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
Symbol
OVX
OVH
OVSG
OR1
VR5
VR4
VR3
VR2
SGND
VR1
V400m
PMIN
PMAX
VRH
VR
CCMP
R9K
R1K
CA-
CA+
FREQ
BUZIN
BUZOUT
OSC1
OSC2
EOC
VCC
STATUS
SCLK
OSC4M
V-
V-
DGND
AGND
AGND
V+
V+
LBATT
Type Description
I
I
I
O
O
O
O
O
G
I
I
O
O
O
O
I
O
O
I/O
I/O
I
I
O
I
O
O
I
I/O
I
I
P
P
G
G
G
P
P
I
Input high voltage for resistance measurement.
Output connection for resistance measurement.
Sense low voltage for resistance measurement.
Reference resistor connection for 399.9Ω range.
Voltage measurement
÷
10000 attenuator (4000V.)
Voltage measurement
÷
1000 attenuator (400.0V.)
Voltage measurement
÷
100 attenuator (40.00V.)
Voltage measurement
÷
10 attenuator (4.000V.)
Signal Ground.
Measurement input.
400mV independent input.
Minimum peak hold output.
Maximum peak hold output.
Output of band-gap voltage reference. Typically -1.2V
Reference input voltage connection. Typically -200mV
In capacitor mode, a compensation capacitor is connected.
Connect to a 9KΩ resistor for capacitor measurement
Connect to a 1KΩ resistor for capacitor measurement.
Negative auto-zero capacitor connection for capacitor measurement.
Positive auto-zero capacitor connection for capacitor measurement.
Frequency counter input, offset to V-/2
Enables the buzzer. High action.
Outputs a 2KHz audio frequency signal for driving piezoelectric buzzer
when BUZIN is High.
Crystal oscillator input connection.
Crystal oscillator output connection.
End of conversion indicator
The high level of digital I/O signals, which is connected to VCC pin of
microprocessor.
ES51966 sends current status to microprocessor or receives controlled
status from microprocessor.
Clock input from microprocessor.
Crystal oscillator selection. NC for 4MHz; connect to V- for 10MHz.
Negative supply voltage, connected to cathode of battery typically.
Negative supply voltage, connected to cathode of battery typically.
Digital Ground ( Output of on-chip DC-DC converter ),
V
DGND
= ( V+ - V- ) / 2
Analog Ground
Analog Ground
Positive supply voltage
Positive supply voltage
Low battery voltage detection
8 , 16 , 19 , 26 , 28 , 30 , 32 , 33 , No connected
36 , 39 , 45 , 47
P: Power,
G: Ground,
I: Input,
O: Output
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06/04/25
ES51966
4 3/4 and 5 3/4 A/D (Peak &Cap)
Operation Mode
(1) Digital Interface between ES51966 and Microprocessor
The EOC, SCLK and STATUS of the ES51966 are used as digital communicating
interface between ES51966 and microprocessor. The STATUS pin is bi-directional, and
the others are unilateral: EOC is from ES51966 to microprocessor and SCLK is from
microprocessor to ES51966. The timing and data of the communication are as follows:
mode 1:
ES51966 receives controlled status from microprocessor.
Force A/D entering into AZ phase
t
1
t
6
t
7
SCLK(I)
t
2
START
t
3
t
4
t
5
t
5
END
t
8
E
t
9
D
F
(VCC)
(V-)
STATUS(I/O)
A
B C
status
(VCC)
(V-)
Timing of the above figure:
t
1
(1040 ~ 4096)
T
t
2
512
T
t
3
(4 ~ 256)
T
t
4
> 4
T
t
5
(16 ~ 1024)
T
(T = 0.25µs)
t
6
t
7
t
8
t
9
(32 ~ 512)
T
(520 ~ 1020)
T
(0 ~ 256)
T
520
T
Note: 1. At START:
After time A, ES51966 enter into AZ phase. And at the same time, STATUS is
changed from output pin to input pin with a 3uA pull low current provided by
ES51966 internally. Then microprocessor can send control status to STATUS. It
is suggested that microprocessor begins to drive STATUS between B and C.
2. At END:
The microprocessor stopped driving STATUS between D and E, and ES51966
will begin to drive STATUS after F.
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06/04/25
