SM1211E915 Semtech, SM1211E915 Datasheet - Page 72

• Manufacturer Part Number: SM1211E915
• Description: Dev Kit Accessory
• Manufacturer: Semtech

Specifications of SM1211E915

• Modulation Type: FSK, OOK
• Data Rate Max: 200Kbps
• Frequency Range: 902MHz To 928MHz
• Supply Voltage Range: 2.1V To 3.6V
• Module Interface: SPI
• Supply Current: 25mA
• Accessory Type: RF Module
• Sensitivity: -105dBm
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Package Type: TQFN EP
• Operating Supply Voltage (min): 2.1V
• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Supply Voltage (max): 3.6V
• Sensitivity (dbm): -105dBm
• Rohs Compliant: NA
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

A power-on reset of the SX1211 is triggered at power up. Additionally, a manual reset can be issued by controlling
pin 13.
If the application requires the disconnection of VDD from the SX1211, despite of the extremely low Sleep Mode
current, the user should wait for 10 ms from of the end of the POR cycle before commencing communications over
the SPI bus. Pin 13 (TEST8) should be left floating during the POR sequence.
Please note that any CLKOUT activity can also be used to detect that the chip is ready.
A manual reset of the SX1211 is possible even for applications in which VDD cannot be physically disconnected.
Pin 13 should be pulled high for a hundred microseconds, and then released. The user should then wait for 5 ms
before using the chip.
Please note that while pin 13 is driven high, an over current consumption of up to ten milliamps can be seen on
VDD.
Rev 7 – Sept 2
ADVANCED COMMUNICATIONS & SENSING
7.4. Reset of the Chip
7.4.1. POR
7.4.2. Manual Reset
nd
, 2008
VDD
Pin 13
(input)
VDD
Pin 13
(output)
Undefined
Figure 55: Manual Reset Timing Diagram
Figure 54: POR Timing Diagram
High-Z
Wait for
10 ms
> 100 us
Page 72 of 92
’’1’’
Chip is ready from
this point on
High-Z
Wait for
5 ms
Chip is ready from
this point on
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SX1211