IC Data Sheets
8.
8.13 Diagram
Circuit Diagrams and PWB Layouts
B08B, LNBH23Q (IC 7T50)
Figure 8-13 Internal block diagram and pin configuration
1
8
770_
3
06_100217.ep
s
100217
Block diagram
Pinning information
SDA SCL
LNBH23
ADDR
A-GND
I2C Diagnostics
I2C interface
DSQIN
Vup
VoRX
VoTX
LX
22KHz
Oscill.
PW
M
Con
tro
lle
r
Rsense
EN
VSEL
Linear Post-reg
+Modulator
+Protections
+Diagnostics
ITEST
TTX
EN
VSEL
VOUT Control
EXTM
P-GND
Preregulator
+U.V.lockout
+P.ON reset
Byp
Vcc
Vcc-
L
ISEL
TTX
TEN
DSQOUT
DETIN
22KHz Tone
Amp. Diagn.
22KHz Tone
Freq. Detector
TTX
VCTRL
SDA SCL
LNBH23
ADDR
A-GND
I2C Diagnostics
I2C interface
DSQIN
Vup
VoRX
VoTX
LX
22KHz
Oscill.
22KHz
Oscill.
PW
M
Con
tro
lle
r
Rsense
EN
VSEL
Linear Post-reg
+Modulator
+Protections
+Diagnostics
ITEST
TTX
EN
VSEL
VOUT Control
EXTM
P-GND
Preregulator
+U.V.lockout
+P.ON reset
Byp
Vcc
Vcc-
L
Byp
Vcc
Vcc-
L
ISEL
TTX
TEN
DSQOUT
DETIN
22KHz Tone
Amp. Diagn.
22KHz Tone
Freq. Detector
TTX
TTX
VCTRL
1 n.c .
2 n.c .
3
n.c .
4 LX
5 P -G N D
6
S
D A
7 n.c .
8
n.c .
9
S
C L
10 A D D R
11 D
S
Q o
u
t
12 D
S
Q IN
1
3
E XTM
14 TTX
15 B Y P
16 n.c .
17 n.c .
1
8
V c c -L
19 V c c
20 A -G N D
21 V oR X
22 V oTX
2
3
n.c .
24 n.c .
25 n.c .
26 n.c .
27 V
u
p
2
8
I
S
E L
29 D E TIN
3
0 V C TR L
3
1 n.c .
3
2 n.c .
Connected with power gro
u
nd
s
a
nd to
the gro
u
nd l
a
yer thro
u
gh vi
as
to di
ss
ip
a
te the he
a
t.
Ep
a
d