AT45DB161D-SU-ND in SOIC-8 for $2.26 each
appears to compare favorably against $4.40 for current 128kx8 part
minor concern about write power, but probably red herring
+
+2010.02.08
+- looking at LiPo charger alternatives
+
+ MAX8808 DFN8, not carried by DK
+ MAX8814 DFN8, not carried by DK
+
+ LTC4095 DFN8, LTC4095EDC#TRMPBFCT-ND 2.91 2.34@100
+ 950mA, resistor current set, rate limit input, suspend input,
+ NTC thermal control option, smart CHRG led with 4 states
+ LTC4065 DFN6, LTC4065EDC#TRMPBFCT-ND 2.77 2.23@100
+ 750mA, resistor current set, CHRG led, enable input
+ LTC4065A DFN6, LTC4065AEDC#TRMPBFCT-ND 2.77 2.23@100
+ 750mA, resistor current set, CHRG led, supply present out
+
+ MCP73811 SOT23-5, MCP73811T-420I/OTCT-ND 0.63@1 0.39@100
+ input selects 85 vs 450mA charge current
+
+ MCP73837 DFN10, MCP73837T-FCI/MFCT-ND 1.37@1 0.85@100
+ usb rate select, power good output, dual inputs, dual status
+
+ LX2206 DFN10, LX2206CT-ND 2.68@1 2.01@100
+ rate select, power good output... needs more passives?
+
+ LM3658 DFN10,
+ dual input, dual rate, two status outputs .. not obvious win
+
+ MCP73855 DFN10, MCP73855T-I/MFCT-ND 1.85@1 1.18@100
+ see Microchip app note 971
+
+
+ Talking to Keith, there's no reason we couldn't use an 8-pin PIC to augment
+ a standalone LiPo charger, implementing a timer after vusb application
+ before switching the regulator to high current, to allow the cc1111 time to
+ finish the USB bus negotiation phase. We could also monitor various state
+ bits and multiplex signaling onto one LED. A combo like the MCP73837 plus
+ a PIC10F206 or 220 would net under $1.50 at 100 pieces and be pretty
+ powerful. Since the PIC has avilable weak pull-ups on the gpio lines, the
+ open-drain state outputs from the regulator don't need resistors to be read.
+
+2011.01.17
+- v1.0 and v1.1 boards have a minor error in that the v_lipo sampling resistors
+ are on "the wrong side of the cut" if you try to use a separate pyro battery.
+ The workaround is to cut that trace and put in a jumper, which pretty much
+ requires "return to Bdale for rework". We should fix this for a future PCB
+ revision.
+
+2011.09.12
+- chatted with Adrian some yesterday. He likes a Bosch pressure sensor that
+ is DK 828-1005-1-ND .. i2c output, similar range to our current part but
+ smaller, around $5 at our build quantities.
+
+2011.12.10
+- the Johanson balun/filter for 70cm use with cc1111 is DK 712-1540-1-ND
+ uses less PCB area, but lower performance than the discrete approach
+
+2013.01.04
+- noodling over TM v2.0 .. baro sensor will be hard to handle on cc1111. So,
+ how about 48-pin version of STM32L, cc110L radio, ms5607 and MMA665X accel.
+ Move to the faster lipo charger, too.
+ radio / flash on spi2, sensors on spi1, baro on spi1 alternate pins
+
+2013.05.02
+- serious stab at what should be on TeleMetrum v2 .. used cc115L section from
+ TeleGPS since I didn't have a cc110L data sheet on the plane .. hope it's
+ similar .. need to update to transceiver, not just transmitter!
+
projects / hw / telemetrum / blobdiff