L9637
Monolithic bus driver with ISO 9141 interface
Features
Operating power supply voltage range 4.5 V VS 36 V (40 V for transients) Reverse supply (battery) protected down to VS -24 V Standby mode with very low current consumption ISSB 1 mA @ VCC 0.5 V Low quiescent current in off condition ISOFF = 120 A TTL compatible TX input Bidirectional K-I/O pin with supply voltage dependent input threshold Overtemperature shut down function Selective to K-I/O pin Wide input and output voltage range -24 V VK VS K output current limitation, typ. IK = 60 mA Defined OFF output status in undervoltage condition and VS or GND interruption Controlled output slope for low EMI
SO8
High input impedance for open VS or GND connection Defined output ON status of LO or RX for open LI or K inputs Defined K output OFF for TX input open Integrated pull up resistors for TX, RX and LO EMI robustness optimized
Description
The L9637 is a monolithic integrated circuit containing standard ISO 9141 compatible interface functions.
Table 1.
Device summary
Order code L9637D L9637D013TR E-L9637D(1) E-L9637D013TR
(1)
Package SO8 SO8 SO8 SO8
Packing Tube Tape and reel Tube Tape and reel
1. Device in ECOPACK package (see Section 4: Package information on page 13).
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www.st.com 15
Contents
L9637
Contents
1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 1.2 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Electrical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 2.2 2.3 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 4 5
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
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L9637
Block diagram and pin description
1
1.1
Block diagram and pin description
Block diagram
Figure 1. Block diagram
VCC VS
RTX RL O RRX
K
IK OFF
+
1,75V
TX
+
LI
IL I
RX
+
LO
GND
1.2
Pin description
Figure 2. Pin connection (top view)
RX LO VCC TX 1 2 3 4 8 7 6 5 LI VS K GND
Table 2.
N. 1 2 3 4 5 6 7 8
Pin description
Name RX LO VCC TX GND K VS LI Output for K as input Output L comparator Stabilized voltage supply Input for K as output Common GND Bidirectional I/O Supply voltage Input L comparator Function
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Electrical specification
L9637
2
2.1
Electrical specification
Absolute maximum ratings
Table 3.
Symbol VS VCC VS/dt VLI, K VLO, RX, TX
Absolute maximum ratings (No damage or latch)
Parameter Supply voltage ISO transients t = 400 ms Stabilized voltage Supply voltage transient Pin voltage Value -24 to +36 -24 to +40 -0.3 to +7 -10 to +10 -24 to VS -24 to VCC Unit V V V/s V V
Note:
Max. ESD voltages are 2kV with human body model C = 100pF, R = 1.5k corresponds to maximum energy dissipation 0.2mJ according to MIL883C.
2.2
Table 4.
Symbol TJSDon TJSDoff Rth j-amb
Thermal data
Thermal data
Parameter Temperature K shutdown switch on threshold Temperature K shutdown switch off threshold Thermal steady state junction to ambient resistance Min. 160 150 130 Typ. 155 Max. 200 200 180 Unit C C C/W
2.3
Electrical characteristics
The electrical characteristics are valid within the below defined operating conditions, unless otherwise specified. The function is guaranteed by design until TJSDon temperature shutdown switch-on-threshold.
Table 5.
Symbol VS VCC Tj ICC
Electrical characteristics
Parameter Supply voltage Stabilized voltage Junction temperature see note VCC 5.5 V; VLI,VTX = 0 V Supply VCC current VK VKhigh; VLI VLIhigh VTX = VCC @ VCC 5.5 V
(1)
Test condition
Min. 4.5 3 -40 -5
Typ. 5 1.4 <1
Max. 36 7 150 2.3 5
Unit V V C mA A
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L9637 Table 5.
Symbol ISON ISOFF ISSB Supply VS current
Electrical specification Electrical characteristics (continued)
Parameter Test condition VS 16 V; VLI, VTX = 0 V VK VKhigh; VLI VLIhigh VTX VTXhigh @ VS 12 V VCC 0.5 V @ VS 12 V RX output status LOW 4.5 V VS 18 V RX output status LOW 18 V < VS RX output status HIGH 4.5 V VS 18 V RX output status HIGH 18 V < VS Input threshold hysteresis VKhigh - VKlow @ VTX VTXhigh VK VS; VS, VCC 0 or VS, VCC = open @ VS 6.5 V VTX VTXlow IK 7 mA (2) Min. -24 -24 0.55VS 12 Typ. 1.2 120 <1 0.025 VS 4 Max. 3 220 0.45VS 8 VS VS 0.8 Unit mA A A V V V V V
VKlow
Input voltage low state
VKhigh
Input voltage high state
VKhys
IKoff
Input current
-5
25
A
RKON IKSC VTXlow VTXhigh RRXON RLOON IRXSC ILOSC VRXH VLOH RLO RRX RTX VLIlow
Output ON impedance Shor t circuit current Input voltage LOW state Input voltage HIGH state Output ON impedance Output short circuit current
30 -24 2.5
10 60 40 20
30 100 1 VCC 90 35
mA V V mA
VK VKlow; VLI VLIlow VS 6.5 V IRX, LO 1 mA
9
Output voltage HIGH state
10M RLRX 10M RLLO Output status = (HIGH) -0.15 V VLO VCC + 0.15 V -0.15 V VRX VCC + 0.15 V -0.15 V VTX VCC + 0.15 V LO output status LOW 4.5 V VS 18 V LO output status LOW 18 V < VS
VCC0.25 5 10 -24 -24
VCC0.1 10 20 -
VCC-
V
Output pull-up resistance Input pull up resistance Input voltage LOW state
20 40 0.45VS 8
k k V
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Electrical specification Table 5.
Symbol
L9637
Electrical characteristics (continued)
Parameter Test condition Min. Typ. Max. Unit
VLhigh VLIhys ILI CKi,LO,RX fLI-LO fK-RX fTX-k trLI-LO trK-RX trTX-K tfLI-LO tfK-RX tfTX-K tOFF,LI-LO tOFF,K-RX tOFF,TX-K tON,LI-LO tON,K-RX tON,TX-K
Input voltage HIGH state Input threshold hysteresis Input current Internal output capacities Transmission frequency
LO output status HIGH 0.55VS 4.5 V VS 18 V 12 LO output status HIGH 18 V < VS VLIhigh - VLIlow VLI VS VS, VCC 0 or VS, VCC = open -5 9 V < VS < 16 V (external loads) RKO = 510 , CK 1.3 nF in active mode see Figure 5 -
0.025VS 4 -
VS 0.8 25 20 50
V V A pF kHz
Rise time
Fall time
for the definition of tr, tf see Figure 3 9 V < VS < 16 V (external loads) RKO = 510 , CK 1.3 nF
-
2
6
s
-
2
6
s
Switch OFF time
Switch ON time
for the definition of ton, tOFF see Figure 3. 9 V < VS < 16 V (external loads) RKO = 510 , CK 1.3 nF (inactive mode see Figure 5)
-
4
17
s
-
4
17
s
1. Specs are tested at 5V only. Compliance on Vcc full range is guaranteed by design. 2. For output currents lower than this value a series protection diode can become active. See also Figure 8 and 9.
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L9637 Figure 3. Input to output timings and output pulse shape
VI
Electrical specification
t
VOUT
80% 80%
20%
20%
tr t OFF t ON
tf
t
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Electrical specification Figure 4. ISO application circuit
VS
RTX RLO RRX
L9637
VCC
VS
40V R KO
-
5V
TX
VCC I/O
510 Ohm
K
CK K
+ IK OFF 1,75V
0.4 Ohm
Diagnostic Tester LI
+
RX
I/O uP
LO
+
I/O
L
ILI
GND
VDD
ECU1
K Line
L Line
K
CK
LI
ECU2
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L9637
Functional description
3
Functional description
The L9637 is a monolithic bus driver designed to provide bidirectional serial communication in automotive diagnostic applications according to the specification "Diagnostic Systems ISO9141". The device provides a bidirectional link, called K, to the VBat related diagnosis bus. It also includes a separate comparator L which is also able to be linked to the VBat bus. The input TX and output RX of K are related to VCC with her integrated pull up resistances. Also the L comparator output LO has a pull up resistance connected to VCC. The maximum external pull up resistance at K related to VS should not be higher than RKO 5 k to achieve clear output ON conditions. All VBat bus defined inputs LI and K have supply voltage dependent thresholds together with sufficient hysteresis to suppress line spikes. These pins are protected against overvoltages, shorts to GND and VS and can also be driven beyond VS and GND. These features are also given for TX, RX and LI only taking into account the behavior of the internal pull up resistances. The thermal shut down function switches OFF the K output if the chip temperature increases above the thermal shut down threshold. To reactivate K again the temperature must decrease below the K switch ON temp. To achieve no fault for VS undervoltage conditions the outputs will be switched OFF and stay at high impedance. The device is also protected against reverse battery condition. During lack of VS or GND all pins shows high impedance characteristic. To realize a lack of the VS related bus line LI and K the outputs LO and RX shows defined ON status. Suppressing all 4 classes of "Schaffner" signals all pins can be load with short energy pulses of max. 0.2 mJ. All these features together with a high possible baud rate >50Kbaud, controlled output slopes for low EMI, a wide power supply voltage range and a very small quiescent current during OFF (TX LI K=High) condition ISoff typ 120 A, and a real standby function with zero power consumption ISSB typ 1 A during system de powering VCC 0.5 V make this device high efficient for automotive bus system. After wake up of the system from OFF or SB condition the first output signal will have an additional delay time tdtyp 5 s see also Figure 5. The typical output voltage behavior for the K, LO, RX outputs as a function of the output current is shown in Figure 6. Figure 7 shows a waveform of the output signal when the low level changes from RON * IOUT to IOUT * 2 * RON + UBE state. This variation occurs due to too low output current or after a negative transient forced to the output or to the supply voltage line.
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Functional description Figure 5. Typical timing for mode transitions
O FF a c ti v e O FF a c t iv e
L9637
LI
LO
TX
K
RX
td
t ON
LI - LO
td
t ON
TX - K
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L9637 Figure 6.
IO UT
Functional description Output characteristics at K, LO, RX
IOU T
M IN V OUT = IO U T * R D S O N
R
DSON
p r o t e c tio n d i o d e
V OUT
= IO U T * 2 * R D S O N + U B E VO UT
0 .8 V
Figure 7.
Output signal shape related to output current
V IN
t
VOUT
IO U T * 2 * R D S O N + U B E IO U T * R D S O N IO U T > IO U T M IN IO U T > IO U T M IN I O U T < IO U T M IN t
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Functional description Figure 8. EMS performance (ISO 9141 bus system)
L9637
=
V S = 1 2V
510 Ohm
VS 50 Ohm TX IS O i n te rf a c e K 136 Ohm NAP - 73 S MG 1 0k H z 1 .5 n F P im a x = 5 W 0 .1 - 1 0 0 0 M H z P ro b e 4 0 dB R h o d e & S c h w a rt z
68 Ohm
VS
D
Pi K
RX IS O i n te rf a c e Signal comparison
NAP
DŁ 10% % 10
Figure 9.
P i (m W )
Input power vs. frequency diagram
10000
n o t i n c i d e n t p o w e r re s i s t a n t
5000
1000
i n c id e n t p o w e r r e s i s t a n t
100 1 10 100 1000 f (M H z)
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Package information
4
Package information
In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com. ECOPACK is an ST trademark. Figure 10. SO8 mechanical data and package dimensions
mm DIM. MIN. A A1 A2 b c D (1) E E1
(2)
inch M AX . 1.750 MIN. TYP. MAX. 0.0689 0.0098
TYP.
OUTLINE AND MECHANICAL DATA
0.100 1.250 0.280 0.170 4.800 5.800 3.800 4.900 6.000 3.900 1.270 0.250 0.400 1.040 0
0.250 0.0039 0.0492 0.480 0.0110 0.230 0.0067
0.0189 0.0091
5.000 0.1890 0.1929 0.1969 6.200 0.2283 0.2362 0.2441 4.000 0.1496 0.1535 0.1575 0.0500 0.500 0.0098 1.270 0.0157 0.0409 8 0.100 0 8 0.0039 0.0197 0.0500
e h L L1 k ccc
Notes: 1. Dimensions D does not include mold flash, protrusions or gate burrs. Mold flash, potrusions or gate burrs shall not exceed 0.15mm in total (both side). 2. Dimension "E1" does not include interlead flash or protrusions. Interlead flash or protrusions shall not exceed 0.25mm per side.
SO-8
0016023 D
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Revision history
L9637
5
Revision history
Table 6.
Date 24-Jan-2002 07-Nov-2008
Document revision history
Revision 5 6 Initial release. Document reformatted. Added Table 1: Device summary on page 1. Updated Section 4: Package information on page 13. Updated the values of "stabilized voltage" and "transmission frequency" parameters on Table 5: Electrical characteristics. Changes
15-Jun-2009
7
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