
POM_
POM_B
POM_RE
POM_
POM_
4.2V
PMIC_PB
POM_SHDN
WhenSTM
Ifcoldreset
pusleforP
T
Transisto r
Buffer
CL
O
SE
XD
XD
LinearRegulator
3.3V dc
100mAminimu
<0.25Vdropoutwor
TLV70533 YFP R
c
IN
Transisto r
Buffer
2bootsup,itshouldcheckthere
getsdetecte
,STM32generates
I
_PB_IC.
ansistor
Buffer
EN
OBD_BAT
3.8V dc_EN
FromPOM
Line
fo
5V_EN
STM32F10
64-pi
TFBG
64K FL
20K R
16 4KB FLAS
HSE
8MHz
TXD
RXD
BOOT
RES ETn
UART1
VCC
tcase
GPIO
etreaso
.
negative
4.2Vdc,3A
NWF650
Buck Switching
Power Supply
LT8610AB
4.2Vdc,3.0A
rRegulator
TelitUSB
V,50mA
5.0Vdc
50mA
ForTelitU
NWF65
Pa
R8H6
64
S
M
Page
GPIO OBD _ON
GPIO
GPIO(PA 0)
GPIO
GPIO(PA2)
GPIO(PA3)
GPIO(PA1)
CAN_ TX
SN74LVC
SN 74LVC2G 1 25YZPR
GPIO
GPIO
CAN_ RX
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
GPIO
WF6500
GPIO
GPIO
GPIO
ADC
DAC
OBD_B
2100 uF,
erami
PowerSu
LT
2Mohm
2Mohm
1
1uF
Buck‐boo
5second
Jou lesreq
Assume8
Jou lesfro
Jou les=
Assumein
ESRwors
During3
Assuming
C=(11J*
Assumea
Eachcapi
LinearRegulator
forPOM
3.3 V,100m A
B
0Opera
ge10of11
JPWM_OUTp
J1850/J1708
Circuits
JPWM_OUTn
JPWM_INp
JPWM_INn
J1708_IN
LinearRegulator
Adjustable5/8Vdc
64mApulse doutput
MAX16910CA TA8+T
8V_EN
SCAN_ToolC‐clip
ISO_EN
L_OUT
K_OUT
K_INn
ISO 9141
KWP2000
Circuits
CAN_ENn
TXCAN
RXCA N
CAN
Circuits
CAN_ENn
TXCAN
RXCA N
CAN
Circuits
MAX3051EK
G125YZPR
MODE1
TXCAN
RXCA N
CAN
Circuits
MODE0
TH8056
MAX3051EK
5/8Vdc
BDInterfac
SCAN_ToolC‐clip
SCAN_ToolC‐clip
SCAN_ToolC‐clip
Compar ator
C
UnpluggingDetection
SuperCap
Cooper
Bussman
5F+/‐20%
2.1V
plyBlockDi
000I DC B#TRPBF
oh
10o hm SuperCap
Cooper
Bussman
5F+/ ‐20%
2.1V
HV1020‐2R7505‐R
5F+/‐20%
Diameter=10mm
Lengt h=20mm
ESR=38mOhm
tMethod
@500 m Aaverageload
uiredatload=V*I*time=3.8*0.5*5=9.
%efficiencyfrom theLTC 3113Regulator.
mcaps=9.5/0 .85=11J
CV^2
itialmaxESRpercapof0.038ohms,+200%
caseatendoflife ,inseries ,thus0. 038x2x
peaksfromthecellularmodule,LTC3113ha
a1.5A/ 0. 85, or1.76Asourcefrom thecaps,
2)/(( 4.2–0.268)^2– (1. 8+ 0.2 68) ^ 2))=1.97F
+/‐20%toleranceofthecapacitance.
nserieshastobenomin allyratedat(1.97x
tionsM
J1850p
J1850n
OBD
OBD
OBD
OBD _BAT_Swit ched
36 VdcMax
ISO_L
ISO_K
OBD
OBD
CAN_H
CAN_L
OBD
OBD
CAN_H
CAN_L
+T
OBD
OBD
CAN_H
OBD
ADG1412
+T
OBD
InputRequ
5to36Vdc
<4mAsleep
eBlockDia
M
_INT
SwitchingBuck/
BoostRegulator
LTC 3113
3A
InputVoltage=1.8 to5. 5Vdc
Cost=$2. 80
IQ=40uA
gram
EN
At1.
At>3
J
fter1000hoursat65C.
2=152mOhms
todeliver1.5A(for1154 uS)
eansa1.76 Ax0.152ohmdrop,or0.268V
)/0.8=4.92 F
nual
Pin 2
Pin 10
Pin 4,5 (GND)
FETSwitch
EN
Voltage
Divider
Pin 15
Pin 7
Pin 6
Pin 14
Pin 3
Pin 11
Pin 1
Pin 16
rements:
ithvoltagetransientlimitingof150V
mode,‘<500 u Apower‐downmode
PTC
Fuse3A
ERB ‐RE3R00V
ram
X2100 uF,
Ceramic
SizingBulkCapsatC
Regulatorprovides
Cellu larmodulereq
Thebulkcapshavet
I=Cdv/dt
1.5=C(3.8–3.3–1
C=1.5Ax1154uS/(
AssumingESR=0,C
Three1500 uFcapac
AssumeESRofcaps
ESRof3parallelcap
ESR=0.04ohm,C=
Threecapsprovide
3.8Vdc
Vdcinput,curre ntout is1.5Ama x
Vdcinput,cu rr ent outis3.0Amax
.
EEE‐FP0J152AP
1500uF,6.3V,20%
$0.20
Aluminum
‐55to105 C
ESR=0.06ohmsnomin
10mmdiamter , 10.2m
3.8Vdc
Supply
Protection
32Vzener
clamped
llular Modul
.5Aworstcase.
ires3Afor1154uS,worstcase.
oprovide3–1.5,or1.5Afor1154 u S.
.5*ESR)/1154 u S
3.8–3.3–1.5*ESR)
=3462 uF, 3.46mF,0.0035F
itorsareneeded.
is200 % ofnominal,or0.12ohms
is0.04ohmsmax
934u F
500u F.
length
Wi‐Fi‐800mAMax
LinuxProcessor‐250
GPS ‐100mAmax
Bluetooth‐50mAMa
Total1.2A
Cellular
500mAAverageMaxCurr
3Apeak,1154uS
WhenDUTisunplugg
‐Wi‐Fiturne doff,
‐GPSturne doff
‐Bluetoothturnedof
‐Processorreducesc
‐OBDturne doff
OBD_BAT
AMax
nt
d:
lockspeed