[AK9752]
AK9752
Ultra-small IR Sensor IC with I
2
C I/F
1. General Description
The AK9752 is a very low power and ultra-small infrared-ray (IR) sensor module. It is composed of a
quantum IR sensor and an integrated circuit (IC) for signal processing. The IR sensor’s offset variation is
calibrated at shipment. An integral analog-to-digital converter provides 16-bits data outputs. The AK9752
is applied for detecting human presence.
2. Features
Quantum-type IR sensor
Integrated Temperature sensor:
16-bits Digital outputs to I
2
C bus
Integrated Digital filter:
IR sensor:
Temperature sensor:
-30 ~ 85ºC output on I
2
C bus
Cut-off frequency 2.5Hz, 0.9Hz, 0.45Hz
Cut-off frequency 2.5Hz, 0.9Hz, 0.45Hz, 0.22Hz
I
2
C interface:
Standard mode (100kHz) supported in case of external pull-up voltage VDD ~ 3.63V
Fast mode (400kHz) supported in case of external pull-up voltage VDD ~ 1.95V
Interrupt Function
INTN pin can be used as a read-trigger or an interrupt request of signal level monitoring.
Low Voltage Operation:
Low Current Consumption:
Ultra-small and Thin Package:
1.65 ~ 1.95V
100µA (Max.) in case of 10Hz output (Continuous mode)
10µA (Typ.) in case of 1Hz output (Single shot mode)
6-pin SON
2.2mm x 2.2mm x t0.6mm
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3.
Table of Contents
General Description ............................................................................................................................ 1
Features .............................................................................................................................................. 1
Table of Contents ................................................................................................................................ 2
Block Diagram and Functions ............................................................................................................. 4
4.1. Block Diagram.............................................................................................................................. 4
4.2. Functions ..................................................................................................................................... 4
5. Pin Configurations and Functions ....................................................................................................... 5
5.1. Pin Configurations ....................................................................................................................... 5
5.2. Functions ..................................................................................................................................... 5
6. Absolute Maximum Ratings ................................................................................................................ 6
7. Recommended Operating Conditions................................................................................................. 6
8. Power Supply Conditions .................................................................................................................... 6
9. Electrical Characteristics ..................................................................................................................... 7
9.1. Analog Characteristics ................................................................................................................. 7
9.2. Digital Characteristics .................................................................................................................. 7
9.2.1. DC Characteristics................................................................................................................ 7
9.2.2. AC Characteristics (1): Standard Mode (100 kHz)............................................................... 8
9.2.3. AC Characteristics (2): Fast Mode (400 kHz) ...................................................................... 8
9.2.4. AC Characteristics (3): INTN ................................................................................................ 9
10.
Functional Descriptions ................................................................................................................. 10
10.1.
Power Supply States .............................................................................................................. 10
10.2.
Reset functions ...................................................................................................................... 10
10.3.
Operating Mode ..................................................................................................................... 10
10.4.
Descriptions for each Operating Mode ...................................................................................11
10.4.1.
Stand-by Mode (MODE [1:0] = “00”) ...............................................................................11
10.4.2.
Continuous Mode (MODE [1:0] = “01”) ............................................................................11
10.4.3.
Single Shot Mode (MODE [1:0] = “10”) ...........................................................................11
10.5.
Read Measurement Data ....................................................................................................... 12
10.5.1.
Normal Read-out Procedure ........................................................................................... 12
10.5.2.
Read-out Data during a measurement Period................................................................ 13
10.5.3.
Skipping Data.................................................................................................................. 13
10.5.4.
End Operation ................................................................................................................. 14
10.5.5.
Example of Read-out Procedure .................................................................................... 14
11.
Serial Interface .............................................................................................................................. 16
11.1.
Data Transfer.......................................................................................................................... 16
11.1.1. Changing state of the SDA line .......................................................................................... 16
11.1.2. Start / Stop Conditions ....................................................................................................... 16
11.1.3. Acknowledge ...................................................................................................................... 17
11.1.4. Slave Address ..................................................................................................................... 18
11.1.5. Write Command .................................................................................................................. 18
11.1.6. Read Command ................................................................................................................. 19
12.
Memory Map.................................................................................................................................. 20
13.
Registers Functional Descriptions................................................................................................. 21
14.
Spectrum Sensitivity (Reference).................................................................................................. 29
15.
Field of View (Reference) .............................................................................................................. 30
16.
IR sensor output (Reference) ........................................................................................................ 31
17.
Recommended External Circuits................................................................................................... 32
18.
Package ......................................................................................................................................... 33
18.1. Outline Dimensions ..................................................................................................................... 33
18.2. Pad dimensions ........................................................................................................................... 34
18.3. Marking ........................................................................................................................................ 35
19.
Ordering Guide .............................................................................................................................. 35
1.
2.
3.
4.
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5.
5.1. Pin Configurations
Pin Configurations and Functions
IR receiving surface
VSS
VDD2
VDD1
1
2
3
6
5
4
SCL
SDA
INTN
SCL
SDA
INTN
6
5
4
1
2
3
VSS
VDD2
VDD1
Exposed pad
Top View
Bottom View
Note: Exposed pad internally connects to VSS pin.
Figure 5.1 Pin Configurations
5.2. Functions
Table 5.1 Functions
Pin
No.
1
2
3
Name
VSS
VDD2
VDD1
I/O
-
-
-
Function
Ground Pin.
Power Supply Pin.
Connect together with VDD1 line on a board. (VDD2=VDD1=VDD)
Power Supply Pin.
Connect together with VDD2 line on a board. (VDD1=VDD2=VDD)
Interrupt Pin.
It goes to “L” in the following cases.
(1) ADC output is ready to be read.
(2) IR output or Temperature Sensor output exceeds the specified threshold levels.
INTN pin is an open drain output (N-type transistor), and connected to a power line of
1.65V ~ 3.63V through a pull-up resistor.
I
2
C Data In/Output Pin.
A bidirectional pin which is used to transmit data into and out of the device. It is
composed of a signal input and an open drain output (N-type transistor). SDA pin is
connected to the following power line through a pull-up resistor.
VDD ~ 3.63V at Standard mode (100kHz)
VDD ~ 1.95V at Fast mode (400kHz)
Refer to the note in “17. Recommended External Circuits”
I
2
C Clock Input Pin.
Signal processing is executed at the rising and falling edge of SCL clock. SCL pin is
connected to the following power line through a pull-up resistor.
VDD ~ 3.63V at Standard mode (100kHz)
VDD ~ 1.95V at Fast mode (400kHz)
Refer to the note in “17. Recommended External Circuits”
4
INTN
O
5
SDA
I/O
6
SCL
I
016016473-E-00
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