low power DigiPyro
TM
Infrared Sensing Solutions
Product Specification
PYQ 1548 / 7660
Features
• Integrated digitization
• Motion detection unit with
Interrupt function
• Low-power consumption of only
3 µA at 1.8 V.
• Smaller ceramic pyroelectric
elements
• Quad detector with
0.8 × 0.8 mm2 elements
• 140◦ field-of-view
• TO-5 metal housing for high EMI
immunity
Low Power Small Quad Element Pyro
The PYQ 1548 is a serial opposed format, four elements detector based on
pyroceramic.
It features smaller elements for the use of short focal length lenses such as
the D37 lens.
The signal is converted to a digital value using Sigma-Delta and DSP techniques. A configurable motion detection unit is implemented. Once motion
was detected, an interrupt will be send to the host system. Putting the host
system to sleep an overall ultra low power consumption will be achieved. All
data is accessible by the host system to enable advanced signal analysis with
your own detection criteria. Excelitas digital solutions provide excellent EMI
immunity.
Issued: 20/03/2018 / Revised: 17/04/2019
• Optimal for fast designs
Applications
• Short distance motion detection
(with lens)
• Energy saving applications
• Intrusion alarms
• Ceiling mounting applications
• Battery operation
Contents
1 Physical Characteristics
1.1 Pyro-Electric Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Optical Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Filter Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Electrical Characteristics
2.1 Absolute Maximum Ratings
2.2 Electrical Data . . . . . . .
2.3 Interface Overview . . . .
2.4 Motion Detection Unit . .
2.5 Configuration Register . .
2.6 Serial In Interface . . . . .
2.7 Direct Link Interface . . .
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3
4
5
6
7
7
8
9
10
10
12
12
3 Handling, Operation and Precautions
15
3.1 Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Quality and Statements
16
5 Packaging
17
PYQ 1548 / 7660
Physical Characteristics
Table 1: Summary of physical characteristics. Parameters and data refer to an ambient temperature of 25 ± 3 ◦C.
Parameter
Symbol
Min
Housing
Field of View
Typ
Max
Unit
TO-5
FOV
Element Size
Spacing
Responsivity
R
Match
Match/R
8.4
140
0.8 × 0.8
0.8
10.2
Noise
60
IR-Filter
Standard
Remarks/Conditions
see fig. 1
◦
see sec. 1.2
mm
see fig. 1
mm
see fig. 1
kV W−1
see sec. 1.1
%
see sec. 1.1
µVpp
see sec. 1.1
10
200
see sec. 1.3
Figure 1: Dimensions and Connections. Explanations follow in this document.
3
Excelitas Technologies GmbH & Co. KG
Wenzel-Jaksch-Str. 31
65199 Wiesbaden Germany
Tel.: +49 (0)611 492 0
Fax.: +49 (0) 611 492 177
www.excelitas.com
Product Specification
1
Issued: 20/03/2018 / Revised: 17/04/2019
PYQ 1548 / 7660
Pyro-Electric Elements
The element configuration is shown in figure 1. It features a quad element configuration in a serial opposed
format. Its typical application is short distance, ceiling mounted, motion detection .
Figure 2: Test set up for the measurement of responsivity and match.
1
2
3
4
6
5
DSP
Display
Figure 3: Masking of elements to test the electrical parameters.
Responsivity A
B
C
D
Match
Noise
Cover Plate
The typical set-up for the measurement of responsivity and match is illustrated in figure 2. The black body (BB)
radiator (1) is set to 373 K (100 ◦C). The signal is modulated by a rotating chopper (2). An aperture (3) is used
to adjust the radiation flux. The cover plate (4) is masking the elements as shown in figure 3. The sensor (5) is
interfaced to a signal processing chain (6). To measure noise, a bandpass filter in the range of 0.4 Hz to 10 Hz is
applied.
Responsivity (R ) and match are measured at a modulation frequency of 1 Hz.
The match is defined by
Match
R
× 100
(1)
Noise is measured shut from infra-red energy. The measurement is performed after a settling time of 10 min at
an ambient temperature of 25 ◦C ± 3 ◦C. Noise is monitored for the duration of 600 s .
4
Excelitas Technologies GmbH & Co. KG
Wenzel-Jaksch-Str. 31
65199 Wiesbaden Germany
Tel.: +49 (0)611 492 0
Fax.: +49 (0) 611 492 177
www.excelitas.com
Product Specification
1.1
Issued: 20/03/2018 / Revised: 17/04/2019
PYQ 1548 / 7660
Product Specification
1.2
Issued: 20/03/2018 / Revised: 17/04/2019
Optical Properties
Figure 4: Illustration for the definition of the horizontal field of view (FOV).
FOV
The horizontal field of view (FOV) as drawn to figure 4 is given as the geometrically unobstructed light path to
both elements. The FOV of 140◦ is given for the optical light acceptance with the full so-called common mode
suppression.
The optical distance as it is given in figure 1 represents the effective focal plane for the application specific optics.
The optical distance is shorter than the geometrical due to refraction of light in the filter.
5
Excelitas Technologies GmbH & Co. KG
Wenzel-Jaksch-Str. 31
65199 Wiesbaden Germany
Tel.: +49 (0)611 492 0
Fax.: +49 (0) 611 492 177
www.excelitas.com
PYQ 1548 / 7660
Product Specification
1.3
Issued: 20/03/2018 / Revised: 17/04/2019
Filter Properties
Table 2: Filter properties
Parameter
Symbol
Min
Average Filter Transmittance
TA
77
Average Filter Transmittance
TA
Cut-on Wavelength
λ(5 %)
Typ
5.2
Max
5.5
Unit
Remarks/Conditions
%
7.5 µm < λ < 13.5 µm
λ < 5 µm
at 25 ◦C
0.5
%
5.8
µm
Figure 5: Filter transmittance, typical curve
100
90
80
Transmittance [%]
70
60
50
40
30
20
10
0
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Wavelength [µm]
6
Excelitas Technologies GmbH & Co. KG
Wenzel-Jaksch-Str. 31
65199 Wiesbaden Germany
Tel.: +49 (0)611 492 0
Fax.: +49 (0) 611 492 177
www.excelitas.com
PYQ 1548 / 7660
Electrical Characteristics
2.1
Absolute Maximum Ratings
Table 3: Absolute Maxiumum Ratings. Data applicable to operation at free-air temperature range.
Parameter
Symbol
Min
Operating Voltage
VDD
I pin
−0.3
−100
−40
−40
Current into any pin
Storage Temperature
Operating Temperature
Typ
Max
Unit
3.6
100
85
70
V
Remarks/Conditions
mA
◦C
< 60 % r.H.
◦C
Stresses beyond the limits listed in table 3 may cause permanent damage to the device. Exposure to absolute
maximum ratings for long time may affect the device reliability and may lead to deterioration of any parameter.
7
Excelitas Technologies GmbH & Co. KG
Wenzel-Jaksch-Str. 31
65199 Wiesbaden Germany
Tel.: +49 (0)611 492 0
Fax.: +49 (0) 611 492 177
www.excelitas.com
Product Specification
2
Issued: 20/03/2018 / Revised: 17/04/2019
PYQ 1548 / 7660
Electrical Data
Table 4: Electrical Data. Unless specified differently all data refers to 25 ± 3 ◦C.
Parameter
Symbol
Min
Typ
Max
Unit
Operating Voltage
VDD
1.8
IDD
3.6
3.5
V
Supply Current
3
3
µA
0.2VDD
V
1
2000
2000
µA
Remarks/Conditions
VDD =1.8 V, no load
SERIN
Input Low Voltage
VSIL
Input High Voltage
VSIH
Input Current
ISI
Data Clock Low Time
tSL
Data Clock High Time
tSH
Data In Hold Time
tSHD
Data Load Time
tSLT
0.8VDD
−1
200
200
72
580
V
VSS 580 µs and the supply voltage is within
the specified operating range after Power-Up.
The configuration data is soonest available for read back 1600 µs after tSLT elapsed. To read back the sensor’s
configuration, the DIRECT LINK interface is used.
2.7
Direct Link Interface
The DIRECT LINK interface is a bi-directional one wire serial interface which is used to generate an interrupt or
to continuously retrieve data from the sensor.
Table 6: Content of the DIRECT LINK data stream when reading sensor out.
Bit#
Description
Size[bit]
Remarks
[39]
Out of Range
1
0: PIR was reset 1: Normal operation
[38:25]
ADC counts
14
Value of selected source
[24:0]
Configuration
25
Register settings
Out of Range The ASIC features an out of range detection. Should the signal of the pyroelectric sensor drop
below 511 counts or exceed 214 − 511 counts the input will be shorted for a duration of about 16 ms in order to
discharge the sensor. This is indicated by a 0. A normal operation is indicated with a 1. The bit state remains 0
until the first data packet after the shorting operation is read out.
Out of range conditions may occur for example during strong sensor temperature gradients of more than 1 K min−1 .
ADC counts The data represents either ADC counts after low-pass filtering, after band-pass filtering or the
reference temperature counts. The band-pass filtered data is represented as a two’s complement 14 bit signed
integer value. The low-pass data and the reference temperature data is represented as 14 bit unsigned integer.
12
Excelitas Technologies GmbH & Co. KG
Wenzel-Jaksch-Str. 31
65199 Wiesbaden Germany
Tel.: +49 (0)611 492 0
Fax.: +49 (0) 611 492 177
www.excelitas.com
PYQ 1548 / 7660
The settings of the alarm event unit is contained here. Details are described in section 2.5.
Figure 9: Data Transmission Diagram
tSMPL
PIR status and
ADC data
Setup time
Configuration registers
tBS
tDH
tDS
tBIT
tDL
…
Forced Pulse
Forced Read
LSB bit 0 40f
bit 1 40f
bit 2 40f
bit 3 40f
bit 4 41f
bit 5 41f
bit 23 41f
bit 24 40f
bit 37 41f
bit 38 40f
MSB bit 39 40f
Start Condition
bit 25 40f
…
Interrupt
Pulse
Forced Read
driven by host
®
driven by DigiPyro
host sampling Bit state
Timing The DIRECT LINK interface communication principle is sketched in figure 9. It can be divided into the
start condition and the data stream after it.
The start condition for any communication is indicated by a LOW to HIGH transition of the DIRECT LINK line. That
condition can be initiated either by the host system or the sensor. Initiating the condition with the host system
is called "Forced Readout" mode. Initiating the condition with the sensor is called "Interrupt (driven) Readout"
mode. Whether the sensor or the host is driving the start condition must be set in the sensor’s configuration of
"Operation Mode" (see sec. 2.5).
Wake up Mode The source for the Interrupt is the sensor’s Motion Detection Unit. Once motion was detected
(see sec. 2.4) the sensor will pull the line from LOW to HIGH. The DIRECT LINK line will not automatically fall
back to LOW. To reset the Motion Detection Unit, the host system must pull the line LOW for at least 35 µs. The
host system can (but does not have to) proceed to the Readout of Bits not sooner than 75 µs after the Interrupt
occurred and the DIRECT LINK was HIGH.
In order to recognize the interrupt by the sensor, the host system’s connection to the DIRECT LINK line must have
a high impedance (high Z) and be set to input.
Forced Readout The sensor is expecting the host system to initiate the communication. Forcing DIRECT LINK
to HIGH for at least tDS = 110 µs and then pulling it to LOW will start the communication. The host system can
resume with the Readout of Bits.
13
Excelitas Technologies GmbH & Co. KG
Wenzel-Jaksch-Str. 31
65199 Wiesbaden Germany
Tel.: +49 (0)611 492 0
Fax.: +49 (0) 611 492 177
www.excelitas.com
Product Specification
Configuration
Issued: 20/03/2018 / Revised: 17/04/2019
PYQ 1548 / 7660
Issued: 20/03/2018 / Revised: 17/04/2019
Readout of Bits The readout procedure is started by the forced or interrupt pulse. The low power DigiPyroTM
waits for the next LOW to HIGH transition by the host system. The host system pulls the line HIGH and releases
it (high impedance Z). The low power DigiPyroTM will pull the line LOW for a 0 bit state or keep it HIGH for a 1 bit
state.
The time tBS which the signal needs to settle to a LOW level depends on the capacitive load (e.g. PCB design) at
the DIRECT LINK pin. Hence, it is recommended to start implementing the interface with tBIT close to, but shorter
than 22 µs to ensure proper LOW level settling. In next steps reduce tBIT empirically to optimize for reliable data
transmission at maximum transmission speed.
After reading the line state by the host system, the host pulls the line again LOW to initiate the next bit readout
by a LOW to HIGH transition again. The sequence will be repeated until all bits are shifted out. After the last bit of
bit[0] the host controller must force DIRECT LINK pin to LOW for at least 500 ns and subsequently release DIRECT
LINK (High Z).
It has to be considered that tBIT must not exceed 22 µs to avoid data corruption. Under no circumstances DIRECT
LINK may be at LOW level for longer than 22 µs . It is recommended that the total time to readout one data packet
should not exceed 800 µs to ensure always latest values. In "Interrupt Mode" the total readout procedure must
not exceed tSMPL < 12.5 ms.
It is allowed to cancel the readout at any position of the data stream. To terminate the readout, DIRECT LINK
must be forced to LOW level for at least 145 µs and subsequently released to input (High Z).
In order to reduce settling effects, the data packets have to be read continuously with equal sampling intervals.
14
Excelitas Technologies GmbH & Co. KG
Wenzel-Jaksch-Str. 31
65199 Wiesbaden Germany
Tel.: +49 (0)611 492 0
Fax.: +49 (0) 611 492 177
www.excelitas.com
Product Specification
Interrupt Readout The sensor will drive the line typically every tSMPL = 16 ms HIGH. The host system must
then pull the line to LOW in order to start the communication with the sensor. The host system can proceed to
the Readout of Bits not sooner than 75 µs after the Interrupt occurred and the DIRECT LINK was HIGH.
In order to recognize the interrupt by the sensor, the host system’s connection to the DIRECT LINK line must have
a high impedance (high Z) and be set to input.
The recommended readout mode is the "Forced Readout".
PYQ 1548 / 7660
3.1
Handling, Operation and Precautions
Handling
Shelf Life The product can be stored for 12 months before usage at −10 ◦C to 40 ◦C (
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