Page 1
How to
Ho
w
–
Q
Scope
:
The fol
l
sensors
Interf
a
The co
m
during
t
Physi
c
Serial
I
This ch
a
(SICI).
this, th
e
The tra
n
a bit. T
h
interfac
large b
o
Com
m
A micr
o
(startin
g
•
The ini
t
T". An
e
Program T
to
P
uick
owing inst
r
can be pro
g
ce:
municatio
he progra
m
al Layer
nspectio
n
pter gives
This interf
a
OCD pin
i
smission i
s
ese bits fo
r
e bit-synch
r
undaries).
unication
controller
n
with MS
B
Send a sin
g
o 0 is
o 1 is
ial pulse le
n
xample of
LI4970 –
Q
rog
r
Instr
u
uctions de
s
rammed.
n with the
s
ming com
m
and Con
an overvie
w
ce is avail
a
s used.
based on
t
m a 16bit
c
onous (an
d
Timing
eeds to pe
r
).
le low/hig
h
sent as a s
h
sent as a l
o
gth (T1/T
2
a 1 bit tra
n
uick Instru
am
T
ctio
n
cribe the s
e
ensor is pe
r
ands a vo
l
figuratio
n
about the
ble and fu
n
ransmittin
g
ommand
w
thus robu
s
form the f
o
PWM tra
n
ort low an
d
ng low an
d
) and the
o
smission c
a
ction Guid
e
LI49
Gu
i
quence of
c
formed by
tage of 20.
5
Interfac
e
Serial Ins
p
ctional in
p
a single b
i
ord, simil
a
t) and very
llowing st
e
smission,
w
long high
short high
verall peri
o
n be seen i
n
V1.1
70
de
ommands
the one wi
r
V has to b
(SICI)
ection and
C
arallel wit
h
t to the sen
s
r to the SP
I
flexible in
ps 16 time
s
ith at least
PWM puls
e
PWM puls
e
d T deter
m
below:
how the T
L
e SICI int
e
provided
a
onfigurati
the SPI in
t
or and im
m
interface.
T
timing (wi
t
to send/re
c
30/70 (or
7
(e.g. 2us
l
(e.g. 6us
l
ines the re
a
I4970 curr
rface. In A
d
at the CS p
i
on Interfac
erface mo
d
ediately r
e
his makes
hin some q
ceive 16 bi
t
0/30) duty
ow, 6us hi
g
ow, 2us hi
g
-out time
Page 1
nt
dition,
n.
e. For
ceiving
the
ite
s
cycle:
h)
h)
"Delta-
Page 2
How to
•
s• I
t• I
By che
c
PWM t
r
a 0 or 1
The fig
u
oscillos
•
T
~
OCD Si
Å
Program T
Send a sho
r
end a bit)
f the sens
o
ransmitted
f the sens
o
king the o
u
ansmissio
n
is transmit
t
re below s
cope:
ypical bit
0.4 μs (gi
v
gnal [V]
MSB …
‚sen
LI4970 –
Q
t low puls
e
r transmits
PWM (see
r transmits
tput after t
h
of a bit "
D
ed by the
s
hows a tra
n
transmissi
o
es ~285 k
B
...
0' from
sor Æ µC
uick Instru
(marks th
e
a 1, it pull
s
figure abo
v
a 0, it does
e read-out
elta-T", fo
r
ensor. See
b
smission t
h
n speed (P
W
it/s).
one
b
16 bit are requi
‚1' from
µCÆ sens or
ction Guid
e
end of the
the output
e: 6us-2us
not pull th
e
time (dete
r
this case
4
elow a 1
b
rough the
O
M) is: ~0
it frame
red, starting with M
S
‚1' from
sens or Æ µC
V1.1
transmitte
d
low for th
e
= 4 us)
output lo
w
mined by t
h
us), the m
i
it response
CD pin as
.4 μs / ~1.
6
…
B
…
‚0' from
µC Æ sen
s
PWM and
time diffe
r
e time giv
e
crocontroll
e
example fr
o
could be s
e
μs, check
a
…...
or
syncs the
s
ence given
n by the p
r
er can dete
r
om the TL
I
en using a
n
fter ~1.1μ
s
…
Page 2
ensor to
by the
evious
mine if
4970:
, wait
LSB Æ
Page 3
How to
•
(
The slo
w
on the
S
Please
t
data. M
EEPR
O
Data
L
Seque
n
Algori
t
SICI in
AABFh
R
efres
h
SICI in
8018h
R
ead
E
Read E
E
Read c
o
Please i
pass fil
t
‘00000
0
Note:
W
Every a
(e.g. th
e
Cont
e
Bit:
Program T
Slowest bit
gives ~5 k
B
est mode
ICI interfa
c
ake care to
inimum w
a
M): 25μs (
E
ink La
ye
ce of Co
m
hm freez
e
SICI ou
t
don’t ca
r
EEPRO
M
SICI ou
t
don’t ca
r
EPROM
R
PROM re
g
mmand:
nsert for “r
e
er cut-off
fr
’. Therewi
t
ith the 1st
r
nswer is d
e
same com
m
15
1
1
nt:
LI4970 –
Q
transmissi
o
it/s).
may be use
e.
wait betwe
it time bet
w
EPROM
c
r
mands:
Com
m
e Algor
i
Com
m
e EEPR
O
egister (
o
ister requi
r
gister add
r
equency, r
e
h, the actu
a
ead comm
a
layed by o
n
and agai
n
4 13
1
0 r
uick Instru
n (PWM)
i
ful in disto
r
en SICI fra
m
een cycles
ommands
m
and
thm freeze
and
M refres
h
ptional)
ed to defi
n
ess” the re
g
ad EEPR
O
l content
w
nd, the re
s
e comman
d
), or the n
e
2 11 1
0
egister ad
d
ction Guid
e
s: ~60 μs /
ted enviro
n
mes to allo
w
for read/w
r
ay take lo
Note
Necess
a
get in c
o
EEPRO
M
Note
To be s
u
applied
e, if any c
h
ister you l
i
M register
ill be read
ponse will
(n-1). Eit
h
xt register
9 8
ress
V1.1
~90 μs, ch
e
ments and
/
the sens
o
ite and tes
t
nger).
ry; stops a
n
nflict whil
e
re the corr
e
anges are
n
ke to read
o
0x00. Her
e
out.
not have th
er, a dum
m
can be add
r
7 6
0 0
ck after ~2
or with hig
to decode
command
s
y other act
i
program
m
ct EEPRO
M
ecessary.
ut. E.g. fo
r
, bit [13:8]
content o
f
y comman
d
essed to r
e
5 4
0 0
9 μs, wait
~
h (capaciti
v
and proce
s
(except
vities not t
o
ing the
content
i
changing
t
has to set t
this regist
e
has to be
ad out.
3 2
0 0
Page 3
21 μs
e) loads
s the
s
he low
r.
s
end
1 0
0 0
Page 4
How to
Write
E
Define
t
Send th
Again,
t
register
The ne
x
of the l
o
Provi
d
Now, t
h
Attenti
o
implem
e
1st Pro
The ne
x
Theref
o
Bit [10:
adequa
t
Note:
K
Note:
O
set to “
l
R
efres
h
SICI in
8018h
Write
E
With th
content
,
Theref
o
Cont
e
Bit:
Cont
e
Bit:
Cont
e
Bit:
Cont
e
Bit:
Program T
EPROM
R
he new co
n
e write co
m
he “registe
0x00.
t comman
d
w pass filt
e
e Progra
m
e CS pin (
p
n: If the se
n
nted to pr
o
grammin
g
t step will
p
re, followi
n
8] influenc
e
e one.
eep the pr
o
bserve the
D
ow” when
EEPRO
M
SICI ou
t
don’t ca
r
EPROM
R
e first com
m
the regist
e
re, send th
e
15
1
1
nt:
15
1
0
nt:
15
1
1
nt:
15
1
1
nt:
LI4970 –
Q
R
egister
tent of the
mand:
r address”
h
must be t
h
(EEPRO
M
ming Vo
l
in 5) must
sor is alre
a
tect the co
n
Comman
rogram al
l
g comma
n
the time
o
gramming
D
IO pin: I
t
the progra
m
Com
m
e EEPR
O
R
egister
a
and, just t
r has to be
w
write co
m
4 13
1
0 r
4 13
1
0 0
0
4 13
1
0 0
0
4 13
1
0 r
uick Instru
register.
as to set t
h
e data cont
e
register
0
tage
be provide
d
dy mount
e
troller for
d
changes
w
d has to se
n
f the inter
n
oltage lev
e
will be on
ming is fi
n
and
M refres
h
gain
e ‘0’ valu
e
ritten aga
i
mand
agai
n
2 11 1
0
egister ad
d
2 11 1
0
0 1
2 11 1
0
0 1
2 11 1
0
egister ad
d
ction Guid
e
e right add
r
ent of this
r
x00 influe
n
with the
2
d on PCB,
any overv
o
here the co
n
d:
al program
m
l at pin C
S
“high” du
r
alized. Aft
e
Note
To be s
u
applied
has been
p
n with the
:
9 8
ress
9 8
0 0
9 8
0 0
9 8
ress
V1.1
ess, e.g. ‘0
0
egister, e.g
ce the cut
-
0.5 V prog
r
make sure
y
ltage level
s
tent has a
f
ing pulse
;
!
ing the pro
g
rwards fu
r
re the corr
e
rogramme
d
final data.
7 6
0 0
7 6
0 1
7 6
0 0
7 6
0 0
0000’ to a
for 18kH
z
off freque
n
amming v
o
ou have a
d
!
terwards t
h
typ. this s
e
ramming
(
ther comm
a
ct EEPRO
M
. To progr
a
5 4
0 0
5 4
0 0
5 4
0 1
5 4
0 0
ddress EE
P
cut-off fre
q
cy):
ltage.
ditional h
a
e value ‘0’
.
tting is an
busy) and
w
nds can b
e
content
i
am also th
e
3 2
0 0
3 2
0 0
3 2
1 0
3 2
0 0
Page 4
ROM
uency
rdware
ill be
set.
s
‘1’
1 0
0 1
1 0
1 1
1 0
1 0
1 0
0 1
Page 5
How to
Afterw
a
modify
2nd Pr
o
The sec
Follow
i
Note:
O
set to “
l
Turn o
f
Now, t
h
turned
o
Verify
The pr
o
After e
v
are rep
e
strongl
y
cannot
b
register
Bits [1
4
low, th
e
every p
r
comma
n
even m
a
Reset
To be s
u
Best w
a
Howev
e
(7FFF
h
)
Cont
e
Bit:
Cont
e
Bit:
Cont
e
Bit:
Cont
e
Bit:
Program T
rds, the ne
x
the low pa
s
grammin
g
ond progra
m
ng comma
n
bserve the
D
ow” when
f
f the Pro
g
e program
m
ff.
Program
m
gramming
o
ery pulse t
h
ated as lon
g
recomme
n
e guarante
29h.
:8] of the r
e
length of
a
ogrammin
g
d descript
i
ximum of
re the sen
s
y to do thi
s
r, also a s
o
:
15
1
0
nt:
15
1
1
nt:
15
1
1
nt:
15
1
0
nt:
LI4970 –
Q
t comman
d
s filter cut
-
Comma
n
ming co
m
d has to se
n
D
IO pin: I
t
the progra
m
rammin
g
ing proce
s
ing Qual
f the EEP
R
e sensor c
h
as the ma
r
ded to avo
i
ed). The n
o
sponse gi
v
program
m
comman
d
on above,
e
127, the va
l
or is worki
n
is the po
w
ftware rese
4 13
1
0 0
0
4 13
1
0 0
0
4 13
1
0 1
0
4 13
1
1 1
1
uick Instru
with the
c
off freque
n
d
mand will
d:
will be on
ming is fi
n
Voltage
s itself is f
i
ity
OM is ba
s
ecks auto
m
gin level i
s
d the maxi
m
. of neede
d
e the no. o
f
ing pulse s
h
(bits have
xample is
g
ue shall be
g proper
a
er-down o
ff
t
is possibl
e
2 11 1
0
0 1
2 11 1
0
0 1
2 11 1
0
1 0
2 11 1
0
1 1
ction Guid
e
orrect cont
e
cy:
write all ‘1
“high” du
r
alized. Aft
e
nalized. T
h
ed on an it
e
atically th
e
correct. T
h
um no. o
f
iterations
c
needed pr
o
all be dec
r
gray backg
r
iven for t
h
increased.
gain after
p
f VDD.
. Therefor
e
9 8
0 0
9 8
0 0
9 8
10
9 8
1 1
V1.1
nt has to b
’.
ing the pro
g
rwards fu
r
e 20.5 V p
r
ration pro
c
margin le
v
e maximu
m
pulse itera
an be find
gramming
eased by d
e
ound in th
e
e value 4b)
.
rogrammi
n
, please se
n
7 6
0 1
7 6
0 0
7 6
0 0
7 6
1 1
e sent. E.g.
ramming
(
ther comm
a
ogrammin
g
ess of pro
g
el and if n
no. of pu
l
ions (a su
ff
out by read
pulses. In
c
creasing t
h
1st & 2nd
p
In case th
e
g; a reset h
a
d followin
g
5 4
0 0
5 4
0 1
5 4
0 0
5 4
1 1
like follo
w
busy) and
w
nds can b
e
voltage h
a
ramming p
u
ecessary th
lses is 127.
ficient mar
g
ing the co
n
ase this no
e value [1
0
rogrammi
n
no. is ver
y
as to be pe
r
g comman
d
3 2
0 0
3 2
1 0
3 2
0 0
3 2
1 1
Page 5
ing to
ill be
set.
s to be
lses.
pulses
It is
in level
tent of
. is very
:8] of
g
high or
formed.
1 0
1 1
1 0
1 1
1 0
0 0
1 0
1 1
Page 6
How to
Edition
2
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e
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p
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e
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e
LI4970 –
Q
es AG
any
nologies A
G
.
in this docu
m
espect to an
y
ing the appl
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ghts of any t
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ction Guid
e
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ilure of suc
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egarded as
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Page 6
or
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ort
e health
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