LISA-U series - System Integration Manual
UBX-13001118 - R17
Advance information
System description
Page 73 of 190
If a 3.0 V Application Processor is used, appropriate unidirectional voltage translators must be provided using the
module
V_INT
output as 1.8 V supply, as described in Figure 37.
4
V_INT
TxD
Application Processor
(3.0V DTE)
RxD
RTS
CTS
DTR
DSR
RI
DCD
GND
LISA-U series
(1.8V DCE)
15
TXD
12
DTR
16
RXD
13
RTS
14
CTS
9
DSR
10
RI
11
DCD
GND
0
Ω
0
Ω
TP
TP
0
Ω
0
Ω
TP
TP
1V8
B1
A1
GND
U1
B3
A3
VCCB
VCCA
Unidirectional
Voltage Translator
C1
C2
3V0
DIR3
DIR2
OE
DIR1
VCC
B2
A2
B4
A4
DIR4
Figure 37: UART interface application circuit with partial V.24 link (5-wire) in DTE/DCE serial communication (3.0 V DTE)
Reference
Description
Part Number - Manufacturer
C1, C2
100 nF Capacitor Ceramic X7R 0402 10% 16 V
GRM155R61A104KA01 - Murata
U1
Unidirectional Voltage Translator
SN74AVC4T774 - Texas Instruments
Table 32: Component for UART application circuit with partial V.24 link (5-wire) in DTE/DCE serial communication (3.0 V DTE)
If only
TxD
,
RxD
,
RTS
and
CTS
lines are provided, as implemented in Figure 36 and in Figure 37, and if HW
flow-control is enabled (AT&K3, default setting), the power saving can be activated in this way:
AT+UPSV=1: the module automatically enters the low power idle-mode whenever possible and the UART
interface is periodically enabled, as described in section 1.9.2.3, reaching low current consumption.
With this configuration, when the module is in idle-mode, data transmitted by the DTE will be buffered by
the DTE and will be correctly received by the module when active-mode is entered.
If the HW flow-control is disabled (AT&K0), it is recommended to enable the power saving in this way:
AT+UPSV=2: the module automatically enters the low power idle-mode whenever possible and the UART
interface is enabled by the
RTS
line, as described in section 1.9.2.3, reaching very low current consumption.
With this configuration, when the module is in idle-mode, the UART is re-enabled 20 ms after
RTS
has been
set ON, and the recognition of subsequent characters is guaranteed until the module is in active-mode.