User's Manual
Table Of Contents
- ZTEWelink Hardware Development Guide of ZM8620_V2 Module Product_V2.3.pdf
- Legal Information
- 1 About This Document
- 2 Product Overview
- 3 Mechanic Feature
- 4 Pin Description
- 5 Electric Feature
- 6 Related Test & Testing Standard
- 7 RF Specifications
- 8 Antenna
- 9 Debugging Environment and Method
- 10 Package System
- 11 Safety Information
- 12
Hardware Development Guide of Module Product
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ZM8620_V2
16
UART1_DSR
Data is ready
Power level is 1.8V.
17
UART1_RI
Ringtone indicator
23
UART1_CTS
UART port CTS clear to send
25
UART1_RFR
UART port RFR preparing to
receive
31
UART1_DTR
DTE is ready
33
UART1_DCD
Carrier detection
4.6.2 Electric Feature
During the software interconnection process, there is a method of capturing logs, and it is recommended
that this interface be kept during the design and the testing point be reserved. If the module is used
together with the application processor, and the PWL of it matches with the power level of the module,
the connection mode is as shown in Figure 4-4. The 4-wires or 2-wires mode can also be used for
connection. If it does not match the PWL of AP interface, it is recommended to add the PWL conversion
circuit. Otherwise, it might cause unstable com ports because the level is not matched or cause damage
to the module because it is at high level for long time.
The connection of ZM8620_V2 UART port and standard RS-232-C interface can be through the chip
like class 232. The design involves the transformation of TTL level and EIA level. We recommend to
use the chip of NLSX5014MUTAG. If using the 2-byte serial bus interface, MAX3232 is recommended,
and if using the 8-byte serial bus interface, SP3238 or MAX3238 is recommended. The connection mode
is as shown in Figure 4-5.
ZM8620_V2
AP
RXD
RXDTXD
TXD
CTS
RFR CTS
RFR
DTR
DSRDSR
DTR
DCD
RI RI
DCD
GND GND
Figure 4–4 Module Serial Port & AP Application Processor