TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R07
Advance Information
System description
Page 50 of 158
AT+UPSV=0: power saving disabled, fixed active-mode
The module does not enter low power idle-mode and the UART interface is enabled (data can be sent and
received): the
CTS
line is always held in the ON state after UART initialization. This is the default configuration.
AT+UPSV=1: power saving enabled, cyclic idle/active-mode
When the AT+UPSV=1 command is issued by the DTE, then the UART is immediately disabled by the module.
Afterwards, the UART is enabled again, and the module does not enter low power idle-mode, as following:
Periodically, during each paging reception (see section 1.5.1.5), to temporarily receive or send data over the
UART, e.g. data buffered by the DTE with HW flow control enabled will be correctly received by the module
If the module needs to transmit some data over the UART (e.g. URC), the UART is temporarily enabled
If a data call with external context is activated, the UART is kept enabled
If the DTE send data with HW flow control disabled, the first character sent causes the UART and module
wake-up after ~5 ms: recognition of subsequent characters is guaranteed only after the complete wake-up
(see the following subsection “wake up via data reception”)
The module automatically enters the low power idle-mode whenever possible but it wakes up to active-mode
according to the UART periodic wake up so that the module cyclically enters the low power idle-mode and the
active-mode. Additionally, the module wakes up to active-mode according to any required activity related to the
network (e.g. for the periodic paging reception described in section 1.5.1.5, or for any other required RF Tx / Rx)
or any other required activity related to module functions / interfaces (including the UART itself).
When the UART interface is enabled, data can be received. When a character is received, it forces the UART
interface to stay enabled for a longer time and it forces the module to stay in the active-mode for a longer time,
according to the timeout configured by the second parameter of the +UPSV AT command. The timeout can be
set from 40 2G-frames (i.e. 40 x 4.615 ms = 184 ms) up to 65000 2G-frames (i.e. 65000 x 4.615 ms = 300 s).
Default value is 2000 2G-frames (i.e. 2000 x 4.615 ms = 9.2 s). Every subsequent character received during the
active-mode, resets and restarts the timer; hence the active-mode duration can be extended indefinitely.
The hardware flow-control output (
CTS
line) indicates when the UART interface is enabled (data can be sent and
received), as illustrated in Figure 22.
time [s]
UART disabled
~ 20 ms
UART enabled
~9.2 s (default)
UART enabled
Data input
CTS ON
CTS OFF
2G: 0.45-2.10 s
3G: 0.62-5.10 s
LTE: 0.30-2.52 s
Figure 22: CTS output pin indicates when module’s UART is enabled (CTS = ON = low level) or disabled (CTS = OFF = high level)
