EM MICROELECTRONIC
- MARIN SA
EM4095
Read/Write analog front end for 125 kHz RFID Basestation
Description
The EM4095 (previously named P4095) chip is a CMOS
integrated transceiver circuit intended for use in an RFID
basestation to perform the following functions:
antenna driving with carrier frequency
AM modulation of the field for writable transponder
AM demodulation of the antenna signal modulation
induced by the transponder
communicate with a microprocessor via simple interface.
Features
Integrated PLL system to achieve self adaptive carrier
frequency to antenna resonant frequency
No external quartz required
100 to 150 kHz carrier frequency range
Direct antenna driving using bridge drivers
Data transmission by OOK (100% Amplitude
Modulation) using bridge driver
Typical Operating Configuration
Read Only Mode
RDY /CLK
1
2
3
16
15
14
-
-
-
Data transmission by Amplitude Modulation with
externally adjustable modulation index using single
ended driver
Multiple transponder protocol compatibility
(Ex: EM4102, EM4200, EM4450 and EM4205/EM4305)
Sleep mode 1µA
USB compatible power supply range
-40 to +85°C temperature range
Small outline plastic package SO16
Applications
Car immobiliser
Hand held reader
Low cost reader
Pin Assignment
SO16
C
DC2
C
FCAP
SHD
DEMOD_OUT
MOD
C
AGND
C
DEC
VSS
RDY/CLK
ANT1
DC2
FCAP
SHD
DEMOD_OUT
MOD
AGND
CDEC_IN
CDEC_OUT
L
A
C
RES
C
DV1
C
DV2
+5V
4
5
6
7
8
EM4095
P4095
13
12
11
10
9
P
DVDD
DVSS
ANT2
VDD
DEMOD_IN
+5V
Fig. 1
Fig. 3
Read/Write Mode
RDY /CLK
1
2
3
16
15
14
C
DC2
C
FCAP
SHD
DEMOD_OUT
MOD
C
AGND
C
DEC
+5V
L
A
C
RES
C
DV1
C
DV2
+5V
4
5
6
7
8
EM4095
P4095
13
12
11
10
9
P
Fig. 2
Copyright
2013,
EM Microelectronic-Marin SA
4095-DS.doc, Version 4.2, 22-Apr-13
1
www.emmicroelectronic.com
EM4095
System principle
Transponder
Transceiver
R/W configuration
RDY/CLK
1
2
3
16
15
14
Coil1
Read Only
and
R/W Chip
Coil2
C
DV
1
C
DC2
C
FCAP
SHD
DEMOD_OUT
MOD
C
AGND
C
DEC
+5V
L
A
C
RE
S
4
5
6
7
8
EM4095
13
12
11
10
9
P
+5V
C
DV
2
UPLINK
Signal
on
Transceiver
coil
Signal
on
Transponder
coil
DOWNLINK
Signal
on
Transponder
coil
RF
Carrier
Data
Signal
on
Transceiver
coil
RF
Carrier
Data
Fig. 4
Copyright
2013,
EM Microelectronic-Marin SA
4095-DS.doc, Version 4.2, 22-Apr-13
2
www.emmicroelectronic.com
EM4095
Absolute Maximum Ratings
Parameter
Storage temperature
Maximum voltage at V
DD
Minimum voltage at V
DD
Max. voltage other pads
Min. voltage other pads
Max. junction temperature
Electrostatic discharge max.
to MIL-STD-883C method
3015 against V
SS
Electrostatic discharge max.
to MIL-STD-883C method
3015 (only for pins ANT1
and ANT2) against V
SS
Maximum Input/Output
current on all pads except
VDD, VSS, DVDD, DVSS,
ANT1, ANT2, RDY/CLK
Maximum AC peak current
on ANT1 and ANT2 pads
100 kHz duty cycle 50%
Symbol Conditions
T
STO
-55 to +150°C
V
DDmax
V
SS
+6V
V
DDmin
V
SS
-0.3V
V
MAX
V
DD
+0.3V
V
MIN
V
SS
-0.3V
T
JMAX
+125°C
V
ESD
V
ESD_ANT
4000V
Handling Procedures
This device has built-in protection against high static
voltages or electric fields; however, anti-static precautions
must be taken as for any other CMOS component. Unless
otherwise specified, proper operation can only occur when
all terminal voltages are kept within the voltage range.
Unused inputs must always be tied to a defined logic
voltage level.
Operating Conditions
Parameter
Operating junction
temperature
Supply voltage
Antenna circuit
resonant frequency
AC peak current on
ANT1 & ANT2 pads
C
FCAP
C
DEC
C
DC2
C
AGND
Package thermal
resistor SO16
Symb
T
J
V
DD
F
RES
I
ANT
*
*
*
100
69
10
100
6.80
70
Min
-40
4.1
100
Typ
Max
+110
5.5
150
250
*
*
*
220
71
Units
°C
V
kHz
mA
nF
nF
nF
nF
°C/W
8000V
5
125
I
IMAX
I
OMAX
I
ANTmax
10mA
300mA
R
th j-a
Stresses above these listed maximum ratings may cause
permanent damages to the device. Exposure beyond
specified operating conditions may affect device reliability or
cause malfunction.
*
10%
tolerance capacitors should be used
** According to 1S2P JEDEC test board
Due to antenna driver current the internal junction temperature is
higher than ambient temperature. Please calculate ambient
temperature range from max. antenna current and package
Thermal Resistor. It is the user's responsibility to guarantee that T
J
remains below 110°C.
Supply voltage (V
DD
and DV
DD
pads) must be blocked by a 100nF
capacitor (to V
SS
) as close as possible to the chip
Copyright
2013,
EM Microelectronic-Marin SA
4095-DS.doc, Version 4.2, 22-Apr-13
3
www.emmicroelectronic.com
EM4095
Electrical and Switching Characteristics:
Parameters specified below are valid only in case the device is used according to Operating Conditions defined on previous
page.
V
SS
=D
VSS
=0V, V
DD
=D
VDD
= 5V, T
j
= -40 to 110°C, unless otherwise specified
Parameter
Symbol Test Conditions
Min
Typ
Max
Units
I
DDsleep
Supply current in sleep mode
1
2
µA
I
DDon
Supply current excluding drivers
5
7
mA
current
V
AGND
AGND level
Note 1
2.35
2.5
2.65
V
Logic signals SHD, MOD,
DEMOD_OUT
Input logic high
Input logic low
Output logic high
Output logic low
MOD pull down resistor
SHD pull up resistor
PLL
Antenna capture frequency range
Antenna locking frequency range
Drivers
ANT drivers output resistance
RDY/CLK driver output resistance
AM demodulation
V
CM
DEMOD_IN common mode range
V
SS
+ 0.5
V
DD
- 0.5
V
DEMOD_IN input sensitivity
V
sense
Note 2
0.85
2
mVpp
Note 1: A
GND
is a EM4095 internal reference point. Any external connection except specified capacitor to V
SS
may lead to device
malfunction.
Note 2: Modulating signal 2 kHz square wave on 125 kHz carrier, total signal inside V
CM
Vsense
V
IH
V
IL
V
OH
V
OL
R
PD
R
PU
0.8V
DD
0.2V
DD
I
SOURCE
=1mA
I
SINK
=1mA
0.2V
DD
0.8V
DD
0.9V
DD
20
20
50
50
0.1V
DD
90
90
V
V
V
V
k
k
F
ANT_C
F
ANT_L
100
100
150
150
kHz
kHz
R
AD
R
CL
I
ANT
=100mA
I
RDY/CLK
=10mA
3
12
9
36
Copyright
2013,
EM Microelectronic-Marin SA
4095-DS.doc, Version 4.2, 22-Apr-13
4
www.emmicroelectronic.com
EM4095
Timing Characteristics:
Parameters specified below are valid only in case the device is used according to Operating Conditions defined on previous
page.
V
SS
=D
VSS
=0V, V
DD
=D
VDD
= 5V
Parameter
Symbol
Test Conditions
Typ
Max
Units
Tset
Set-up time after a sleep period
25
35
ms
Tmdon
Time from full power to modulation
antenna circuit specifications:
50
µs
Q=15,FRES=125Khz
state
modulation index: 100%
AM demodulation: Delay time from
Modulating signal 2Khz square
Tpd
40
120
µs
input to output
wave 10mVpp
Recovery time of reception after
Trec
Note 1
400
500
µs
antenna modulation
Note 1:
RF period is time of one period transmitted on ANT outputs (at 125 kHz 8µs). Trec after antenna modulation receiver
chain is ready to demodulate. The condition is of course that the amplitude on antenna has already reached its steady state by
that time (this depends on Q of antenna). See also Application Notes.
Block Diagram
VDD
VSS
SHD
AGND
to all blocks
to all blocks
to all blocks
BIAS &
AGND
BIAS & AGND
to all blocks
SHORT
DETECTION
& READY
RDY/CLK
FCAP
LOOP
FILTER
HOLD
LOCK
VCO &
SEQUENCER
ANTENNA
DRIVERS
DVDD
ANT1
ANT2
DVSS
MOD
SY NCHRO
DMOD_IN
SAMPLER
FILTER
COMPARATOR
DMOD_OUT
CDEC_OUT
CDEC_IN
DC2
Fig. 5
Copyright
2013,
EM Microelectronic-Marin SA
4095-DS.doc, Version 4.2, 22-Apr-13
5
www.emmicroelectronic.com
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