User's Manual

Storage conditions Transmitter temperature: -13°F to 131°F (-25°C to 55°C)
Transmitter relative humidity: 10% to 100% with condensation
Transmitter pressure: 8.9 to 15.4 psi (61.36 to 106.17 kPa)
Charger temperature: 14°F to 122°F (-10°C to 50°C)
Charger relative humidity: 10% to 95% with no condensation
Battery life Transmitter: Seven days of continuous glucose monitoring immediately
following a full charge
Charger: Completes 40 typical charging operations using a new AAA
alkaline battery
Transmitter frequen-
cy
2.4 GHz, 2M65G1D modulation, less than 1mW ERP
Radio Frequency (RF)
communications
Pump to transmitter frequency: 2.4 GHz; proprietary Medtronic proto-
col; range up to 6 feet (1.8 meters).
Utilizes the IEEE 802.15.4 protocol with proprietary data format.
Transmitter expected
service life
The transmitter expected service life is 1 year depending on patient
usage.
GST3C wireless communication
Quality of service
The transmitter and the MiniMed 640G insulin pump are associated as part of an
802.15.4 network for which the pump functions as the coordinator and the transmitter
as an end node. In an adverse RF environment the pump will assess channel
changing needs based on "noise" levels detected during an energy scan. The pump
will perform the energy scan if after 10 minutes no CGM transmitter signal has been
received. If the channel change occurs the pump will send beacons on the new
channel.
The transmitter will initiate a channel search when beacon detection fails on the
associated channel. The search will be conducted across all five channels. When the
beacon is located the transmitter will rejoin on the identified channel. Upon re-
association any missed packets (up to 10 hours) will be transmitted from the
transmitter to the pump.
In normal operation the transmitter will transmit a packet every 5 minutes and
retransmit the packet if the data is corrupted or missed.
Data security
The MiniMed 640G insulin pump is designed to only accept radio frequency (RF)
communications from recognized and linked devices (you must program your pump
to accept information from a specific device).
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English
MP6025977-021 / 1
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