ES51963
4 1/2 DMM
Features
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22000 counts, adjustable
PEAK Hold function with calibration
mode
Input signal full scale = 220 mV
(sensitivity = 10 uV/count)
X10 function (sensitivity = 1 uV/count)
Conversion rate selectable
On chip buzzer driving, frequency
selectable
Low battery detection
Zero calibration for eliminating offset
error
Using 5V or 3V microprocessor
I/O port with microprocessor (3 pins)
Two formats for data acquisition
single 5V or 6V DC power supply
(V+ to V-)
28 pin SOP package
General Description
ES51963 is a 22000 counts dual-slope
analog-to-digital converter (ADC) with X10
and PEAK Hold functions. The conversion
rate and buzzer frequency can be selected or
decided by an external microprocessor. The
conversion rate can vary from 2 times/sec to
100 times/sec under 4 MHz operating clock.
The buzzer frequency can be chosen to be
audible among operating clock frequency
range from 400 KHz to 6 MHz. In addition,
other functions for low battery detection, on
chip buzzer driving, and I/O port with micro-
processor are also provided.
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
TAIWAN PATENT NO. 476418
U.S. PATENT NO. 6,429,696
1
2003/9/1
ES51963
4 1/2 DMM
Electrical Characteristics
TA=25°C, DGND=AGND=0V, operating clock = 4 MHz.
Symbol Parameter
Test Condition
V+
Positive Power Supply
V-
Negative Power Supply
I(V+) Operation
Normal power on (V+ to V-)
Supply Current
I(GND) Supply Current of
∆V
between DGND and V-
DGND to V-
is -0.2V
Zero
Zero Input Reading
1 MΩ input resistor, null to
zero by uP.
NLV1 Nonlinearity (Voltage x1) Best case straight line
conversion rate = 10 times/s
REV1 Rollover Error
1 MΩ input resistor
(Voltage x1)
conversion rate = 10 times/s
NLV10 Nonlinearity
Best case straight line
(Voltage x10)
conversion rate = 10 times/s
REV10 Rollover Error
1 MΩ input resistor
(Voltage x10)
conversion rate = 10 times/s
V12
Band Gap Voltage
100 kΩ between V12 and
Reference
AGND
LBATT Low Battery Detection LBATT to V12
PEAK Hold value
½用
10nF
聚㆚酯薄膜電容
accuracy (10us)
(polyester, Mylar)
TCRF Reference Voltage (V12) 100 kΩ between V12 and
Temperature Coefficient AGND (0°C to 70°C)
Min.
2.3
-2.3
-
5
-0
-0.02
-0.02
-0.04
-0.04
-1.31
-60
-1.2
-25
-
Typ.
2.5
-2.5
1.0
10
0
-
-
-
-
-1.23
0
-
50
Max.
3.3
-3.3
1.7
-
+0
0.02
0.02
0.04
0.04
-1.10
60
+1.2
+25
-
Unit
V
V
mA
mA
count
%F.S.
%F.S.
%F.S.
%F.S.
V
mV
%F.S.
±count
ppm/°C
2
2003/9/1
ES51963
4 1/2 DMM
Pin Configuration
SOP 28pin package:
LBATT
V12
AGND
AGND
Cref+
Cref-
Ref+
Ref-
Caz
Cint
Buf
BufX10
Vin-
Vin+
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V+
V-
DGND
BUZout
BUZin
OSC1
OSC2
EOC
SCLK
STATUS
Vcc(uP)
CP-
CP+
PHin
ES51963
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2003/9/1
ES51963
4 1/2 DMM
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
Description
Low battery voltage detection.
Reference voltage output.
Analog ground, as the voltage reference 0V.
Analog ground, as the voltage reference 0V.
Positive connection for reference capacitor.
Negative connection for reference capacitor.
Differential reference high voltage input.
Differential reference low voltage input.
Auto-zero capacitor connection. (0.47uF)
Integration capacitor connection. (33nF)
Integration resistor connection output. (100kΩ)
Integration resistor connection output. (10kΩ)
Analog differential low signal input.
Analog differential high signal input.
PEAK Hold signal input which is reference to AGND.
Minimum PEAK Hold output. (10nF)
Maximum PEAK Hold output. (10nF)
The high level of digital I/O signals, which is connected to Vcc
pin of microprocessor.
STATUS D, I/O ES51963 sends current status to microprocessor or receives
controlled status from microprocessor.
SCLK D, I Clock input from microprocessor.
EOC
D, O An indicator for integration and de-integration time (format 1) or
conversion end (format 2).
OSC2 D, O Crystal oscillator (output) connection.
OSC1
D, I Crystal oscillator (input) connection.
BUZin D, I Buzzer control input. When connected to DGND, turns the buzzer
on. (default state is pull low to V-)
BUZout D, O Buzzer output. Audio frequency output which drives a
piezoelecric buzzer swing between V+ and V-.
DGND
G Digital ground.
V-
P Negative supply voltage, connected to cathode of battery typically.
V+
P Positive supply voltage, V+ to V- is 5.0V typically.
A : Analog , D : Digital , P : Power , G : Ground , I : Input , O : Output
Symbol
LBATT
V12
AGND
AGND
Cref+
Cref-
Ref+
Ref-
Caz
Cint
Buf
BufX10
Vin-
Vin+
PHin
CP-
CP+
Vcc(uP)
Type
A, I
A, O
G
G
A, I/O
A, I/O
A, I
A, I
A, O
A, O
A, O
A, O
A, I
A, I
A, I
A, I/O
A, I/O
D, I
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2003/9/1
ES51963
4 1/2 DMM
Operation Mode
(1) Operation of ES51963 and the external microprocessor
ES51963 is a microprocessor based data acquisition ADC. ES51963 performs A-to-D
conversion and the microprocessor acquires the results via interface pins: SCLK, EOC and
STATUS. There are two formats for data acquisition. In format 1, ES51963 raises the logic
level of EOC to high during the integration phase (INT) and de-integration phase (DINT).
The microprocessor can acquire the conversion result by counting the time period as EOC is
high. And the microprocessor can obtain the operation status of ES51963 such as conversion
rate, buzzer frequency, sign bit, etc. from pin STATUS. The value of STATUS is read in
serial with clock pin, SCLK which is controlled by microprocessor.
In addition to counting the time period of EOC, ES51963 provides another way, the
format 2 to obtain the conversion result. In format 2 the conversion result is computed by
ES51963 itself and the microprocessor can obtain the output count from pin STATUS.
The decision to choose format 1 or format 2 depends on application. Format 2 is
simple for general application. On the other hand, a microprocessor must set up a timer to
estimate the duration of EOC in format 1. Thus the maximum count or resolution could be
changed by choosing the counting frequency of the timer. For example the maximum counts
of ES51963 operating in format 2 with 4 MHz operating clock is 22,000. The same
resolution is obtained in format 1 with timer counting period, 2 us/count. A higher
resolution, say 44,000 counts, could be achieved by speeding up the counting frequency
twice.
In addition to change operation format, ES51963 allow a user to change the
conversion rate, buzzer frequency on the fly. Their changing methods will be described in
following sections.
(2) Buzzer frequency
ES51963 provides buzzer output at pin BUZout. The pin BUZin (active high) is used
to control whether BUZout should output buzzer wave or not. The default buzzer frequency
is 2 KHz with 4 MHz operating frequency (crystal oscillator frequency at pins OSC1 and
OSC2).
ES51963 provides eight buzzer frequency selection options and the external micro-
processor can choose one frequency that is audible by setting the values of bits, B2, B1 and
B0 in the STATUS word used in communication between ES51963 and the external
microprocessor. The communication protocol will be described in detail in section (6). The
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2003/9/1
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