GR47/48 Design Guidelines
BA/SEM/MS 03:0015 Rev A
LZT 123 7596
19
Many level shifting I/C’s are also available which would perform a
similar function as described above i.e. a suitable device is a Max3372
for level shifting.
Note : ESD protection is not a requirement for the level shifter.
3.8 Software download and logging circuitry
Below the circuitry is shown which allows software download and
logging to be performed.
VCC 3V6
MAX3380E
VIO 2V7
CTMS
CFMS
VCC
0.1uF
1,3,5,7,9,11
2,4,6,8,10,12
34
58
45
46
SERVICE
14
0.1uF
ON/OFF
3
2
5
TD
RD
DTE
9 pin
D-Type
0.1uF
0.1uF
0.1uF
0.1uF
V
L
Fon
Foff
R1OUT
R1IN
T1IN
T1OUT
GND
V+
V-
+
+
+
+
C1+
C1-
C2+
C2-
15
19
13
20
17
5
11
4
8
12
3
2
18
6
1
GM47 SYSTEM CONNECTOR
9
T2IN
R2IN
14
Figure 3.5 Service Circuitry
The data sheet for the Maxim device can be found at
http://pdfserv.maxim-ic.com/arpdf/MAX3380E-MAX3381E.pdf
All manuals and user guides at all-guides.com
