RFM42 Datasheet, PDF (109/110 Pages) –

RFM42/43
15. Errata Details
1. Description: The TX current consumption at +13 dBm does not meet specification; lower power settings are
within specification.
Impact: May impact battery life. The +13 dBm current consumption is at 34 mA versus the data sheet
specification of 28 mA.
Workaround: No workaround exists in the current silicon for +13 dBm; lower power levels are unaffected.
Resolution: Will be fixed in the next revision.
2. Description: Some non-standard frequencies are not supported.
Impacts: Operation in frequencies between 240-280 MHz and 480-560 MHz should be avoided.
Workaround: These are non-standard bands and should result in no customer impact; no workaround at this
time.
Resolution: Will be fixed in the next revision.
3. Description: Radio does not return to the low power state when in Auto TX mode.
Impacts: When using Auto TX mode, the radio will not return to the low power state when the TX FIFO
reaches the empty state.
Workaround: The FIFO underflow interrupt can be enabled allowing the external MCU to wake up when the
TX FIFO is empty and put the radio into the low power state: Program register 05h bit 7(enfferr =
1).
Resolution: Will be fixed in the next revision.
4. Description: Potential modem failure in receive mode with default settings.
Impacts: Under strong blocker conditions, the modem can fail unless the listed workaround is followed.
Workaround: Operate the radio with AFC enabled: Program register 56h to C1h.
Resolution: Will be fixed in the next revision.
5.Description: Default register settings for optimal current consumption.
Impacts: Current consumption.
Workaround: Program register 57h bits 2:0 (cdcurr[2:0] = 001), register 59 bit 6 (fbdivhc = 0), register 5Ah bits
1:0 (vcocur[1:0] = 01).
Resolution: Will be fixed in the next revision.
6. Description: Register modification required for TX data-rates greater than 100 kbps.
Impacts: Eye closure and phase noise.
Workaround: Program register 58h bits 7:6 (cpcurr[1:0] = 11).
Resolution: Will update data sheet to reflect operation.
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