Specifications

MaxStream Commands 7
4.3 Low Power Modes
The MaxStream XStream-PKG wireless modem has several low power modes that enable it to be used in low
power or battery operated environments. While in low power mode, it is only able to check for whatever stimulus
will return the modem to power up mode. No transmitting or receiving can occur.
The power modes and the current usage definitions are listed below:
4.3.1 Pin Power Down
Pin 4 (pwrdwn), on the 9-pin connector controls whether the MaxStream XStream-PKG is in power up or power
down mode. If pwrdwn is low, the modem is powered up and fully operational. If pwrdwn is high, the modem is in
its lowest power mode. This mode allows the lowest power consumption but also requires the user to completely
control the power up and power down of the modem. The modem requires 20 milliseconds to transition from power
down to power up mode. The pwrdwn pin is only active if the modem is set up to operate in this mode, otherwise the
pin is ignored.
4.3.2 Cyclic Power Down
The modem goes into low power mode after a user-defined period of inactivity (no transmission or reception on the
RF channel). The modem remains in the low power mode for a user-defined period of time ranging from 0.5 to 8
seconds. After this period of time the modem returns to power up mode and scans all RF channels for a valid data
packet. If no data packet is found on any channel, the modem returns to low power mode.
If a data packet is found the modem remains powered up and receives the packet and any following packets until
another inactivity timeout. The modem returns to the low power mode after the inactivity time period.
Note:
The modem requires 35 milliseconds (ms.) to scan all channels. The modem requires 20 milliseconds to transition
from low power to power up mode.
4.3.3 Receiver Power Down
The modem goes into power down after a user-defined period of inactivity on the serial receive channel. The
modem transitions to power up mode when a character is received on the serial receive channel.
Power Mode
Description Current
Pin power down An RS-232 input is used to power down the XStream-PKG module < 2 uA
Cyclic power down The modem goes into a low power mode automatically after a defined period of time of
no activity (no received character on the RF channel).
50 uA
Receiver power down The modem powers down automatically after not receiving characters on the serial
channel for a user-defined period of time. Any serial channel received character will
bring the modem to a power up condition.
1 mA
Standby The modem is fully operational and is currently scanning channels for valid data. 50 mA
Transmitting The modem is fully operational and is currently transmitting data. 150 mA
Table 4-2. MaxStream XStream-PKG Power Modes