|
Asahi Kasei Microsystems |
[CQ-209D]
CQ-209D
High-Speed Small-Sized Current Sensor
Overview
The CQ-209D is an open-type current sensor using a Hall sensor which outputs the analog voltage
proportional to the AC/DC current. Quantum well ultra-thin film InAs (Indium Arsenide) is used as the Hall
sensor, which enables the high-accuracy and high-speed current sensing. Simple AI-Shell package with the
Hall sensor, magnetic core, and primary conductor realizes the space-saving and high reliability.
Features
- Bidirectional type
- Electrical isolation between the primary conductor and the sensor signal
- 5V single supply operation
- Ratiometric output
- Low variation and low temperature drift of sensitivity and offset voltage
- Low noise output: 2.1mVrms (max.)
- Fast response time: 1μs (typ.)
- Small-sized surface mount package, halogen free
Functional Block Diagram
P
Magnetic
Core
Amplifier
Buffer
VOUT
Hall
Sensor
Compensation
VSS
Bias Unit
EEPROM Unit
VDD
DATA_IO SCLK
N
Figure 1. Functional block diagram of CQ-209D
MS1374-E-03
-1-
2014/08
[CQ-209D]
Circuit Blocks
Circuit Block
Hall Sensor
Amplifier
Buffer
Compensation
Bias Unit
EEPROM Unit
Magnetic Core
Table 1. Explanation of circuit blocks
Function
Hall element which detects magnetic flux density generated from the measured current.
Amplifier of Hall element‟s output.
Output buffer with gain. This block outputs the voltage (VOUT) proportional to the current
applied to the primary conductor.
Compensation circuit which adjusts the temperature drifts of sensitivity and offset voltage.
Drive circuit for Hall element.
Non-volatile memory for setting adjustment parameters. The parameters are adjusted before
the shipment.
Magnetic core which gathers the magnetic flux density to the Hall element.
Typical Output Characteristics
VOUT
VDD
NP
← CQ-209D ←
(Top View)
IIN
1/2 VDD
VDD
VOUT
−INS
N→P 0
P→N
Figure 2. Typical output characteristics of CQ-209D
Pin/Function
INS IIN
Table 2. Pin-out description
No. Name
I/O
Description
1 DATA_IO
- Test pin (connect to ground)
2 VDD
- Power supply pin (5V)
3 VSS
- Ground pin (0V)
4 VOUT
O Analog output pin
5 SCLK
- Test pin (connect to ground)
6P
7N
I Primary current pin (+)
I Primary current pin (−)
MS1374-E-03
-2-
76
CQ-209D
(Top View)
1 2 345
Figure 3. Pin-out diagram
2014/08
|