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Errata.txt
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Errata.txt
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Rev.B Errata and TODO
=====================
2014/07/29 Done for Rev.C
PENDING: future revision
--------
- voltage shifter -- Another revision PCB? -- Pending
using RS-232C driver is better? ussable for 5V-3.3V shifter?
power consumption?(in comparison with MOSFET shifter)
- UVCC should be connected directly to VUSB? like as VBUS. -- no harm. Pending
UVCC is needed only when USB is plugged.
But it seems to be no harm even if UVCC is powered when not plugged in.
DONE:
-----
- Change drill size of LED and switch to 1.0mm -- Done 07/29
- Placement of USB receptacle --- move Top right hole 0.2mm to the right -- Done 07/29
USB MiniB connector should be left to around 0.3mm
And Top right hole size should be a bit smaller
- Battery cut-off of Lipo protect circuit -- OK 07/03
http://www.adafruit.com/datasheets/Li-poly%20085060-2400mAh.pdf
Charge cut-off: 4.2V
Discharge cut-off: 2.75V
- Xtal: too far from pins. may cause EMI problem. -- Done
- Inductor is too small? -- change footprint bigger. Done
**With NCP1402 inductor(TOKO D63LCB 100uH) whines when step-up converter is working.
NCP1402 needs 47uH instead of 100uH.
Sumida 47uH(6x6mm, CDRH5D28NP) doesn't whine and very calm.(07/07)
TODO: How about TOKO D63LCB 47uH? TOKO is very cheap while Sumida one is expensive(250yen).
Need bigger one? Sumida CDRH6D38NP 7x7mm.
NCP1402 uses Sumida CD54-470L 47uH 0.72A
http://www.sumida.com/products/pdf/CD54.pdf
TOKO D63LCB 0.89A(0.43A?) marutsu
https://www.marutsu.co.jp/data/A921CY.pdf
Sumida CDRH5D28NP-470NC 47uH 0.62A sengoku
Sumida CDRH6D38NP-470NC 47uH 0.95A sengoku
http://www.mouser.com/ds/2/390/CDRH5D28RH125-4194.pdf
http://www.sumida.com/products/pdf/CDRH6D38.pdf
Datasheet of HT7750 uses ABC SR0602 inductor 47-100uH which has around Isat 0.75A-0.55A
- NCP1402 capacitor/inductor configuration -- changed values 07/03 Done
47uH, 10uF/16V and 68uF/10V
instead of HT7750
- schottky land pattern is too small for SOD123 -- Done 06/24
NCP1402 uses MBR0520LT1 20V/0.5A SOD123
Vf 0.38V
RB521S-30 30V/0.2A NG
RB160M-30 30V/1A SOD123 OK
- Capacitor polarity marking of dcdc converter -- Done 07/28
NCP1402 may use tantalum
- R14,D7,D8 are removed -- remove from Schematic 07/03
RN-42 LED_ACT
- R8,R9 values are reversed -- fix values on PCB 07/03
voltage shifter 10k 15k
- RTS, CTS -- Done
NOTE: PD5(CTS) is used as RTS and connected to CTS of RN-42. Confusing? YES.
PD5: RTS->CTS
PF1: CTS<-RTS
*CTS of the module is needed to wake up from deep sleep.
- RN-42 GPIO6 for connection control -- Done
use PF7
SM,4 Master mode can be controled with this port. This seems to be critical.
- Power selector doesn't work; Q4 MOSFET leaks from Lipo to USB power line. -- removed Q4 and added D11 07/03 --Done
Schottky diode can solve simply at the expence of forward voltage drop.
Q4 is on both USB and Lipo actually
Q4 is on and leak when Lipo turns on; Vgs = Gnd(g) - Lipo(s)
- MCP73831 -- Done
Add capacitor C16 on BAT -- 07/03
- Jumper "No Lipo" remove -- 07/04 -- Done
Not needed.
- Fix Ground fill of back side of USB receptacle -- 07/04 -- Done
back side should be filled
- Add JST PH-2 thourough hole pattern -- 07/04 -- Done
JST PH-2 SMT is hard to find
- Remove ISP of RN-42 headers -- 07/04 -- Done
CANCELED:
--------
- Xtal: both TH and SMT components should be applied -- Cancel
Not possible? bottom case touches SMT lands.
- ?current measure point should be closed by default? -- Cancel
YES.
closed solder jumper cannot be created in KiCAD.
- 5V UART interface is preferable? -- NO. 3.3V is better to connect with the module directly.
3.3V RX_33 can not be shared between AVR and external serial adapter. -- R9 is too high and can not sink adapter hi output?
- RN-42 GPIO9 *optional -- Not needed. iOS is not supported.(Apple authenticate co-processor is not available)
to toggle virtual keyboard on iOS
- RN-42 GPIO11 *optional -- Not needed. can be done with configuration
to force HID profile
- Step-up converter(UVLO Under voltage lock out) -- misunderstood 07/04
FACT: UVLO is a function to stop converting when charge source(not Lipo) gets to low voltage.
FACT: Lipo has protection circuit for over discharge/charge
NOT: HT7750A exhausts battery to voltage as 0.9V which is too low for Lipo.
NOT: While other converter which works with Lipo UVLO is 2.1V. This is also still not save for Lipo.
NOT: UVLO is not for Lipo protection? HT7750A should be used with normal dry battery.
Rev.C Errata
============
2014/08/12
- PTC is used only for BT
# schematic Done 09/07
# Canceled
- Capacitor values of NCP1402 should be reversed: 10<->68uF
# schematic Done 09/07
- Rprog of MCP charger: Rp instead of 10K value
# schematic Done 09/07
- C2 is not needed
# schematic Done 09/07
- remove solder jumpers as possible
- leave through hole jumpers and cut power line to measure current
# remove 5V amp measure
# remove HHKB amp measure
# remove 3.3V amp measure
# schematic Done 09/07
- Battery LED controlled by firmware.
This can indicate 'charging' status when powered and 'low voltage alart' when battery drived.
~CHRG: Input: read charger state, Hi-Z: LED off, Low: LED on
LED takes power from PSEL line; powered from USB when avaialble or battery when USB is not available and switched.
- probably need MCP73832 instead of MCP73831
73831 has totem pole upper Pch FET on STAT(CHRG) output and LED current leaks through its body diode when not powered.
The leaked current gives VBUS voltage around 1.5V and controller detects USB plug wrongly in the result.
# schematic Done 09/07 powered from PSEL
- Dual color LED for battery/power status
- connect red to charger status/controller and green to VUSB line/Gnd.
- yellow/orange(red+green): charging(red drived by charger)
- green: powered(full charged)
- red: low voltage alart(drived by controller)
- 3025 red/green LED http://akizukidenshi.com/catalog/g/gI-02548/
# module 09/07
# schematic 09/08
- Dual color LED for BT status and indicator
- green: BT status is connected to RN-42 GPIO5
- yellow: indicator is controlled by firmware
- 3025 yellow/green LED http://akizukidenshi.com/catalog/g/gI-05678/
# schematic 09/08
- Voltage divider switch is needed? its current consumption is critical?
- Solder jumpers to removing wireless function easily even if components are installed
# Cancel 09/07 not needed on second thought
- Power control silk
- box line around components
- Noise from boost converter
Input capacitor 10uF causes whine sound. Removing the 10uF stops the noise.
Tantalum 3528 one recuced a bit in comparison with ceramic one.
With Taiyo Yuden iductor the noise seems to be reduced.
# Use tantalum cap
- No 16MHz silk
- D1 LED footprint revise
- Bivar LED light pipe
- TH LED footprint drill size
- use PF4 to switch ADC voltage divider
- with Nch MOS-FET
- http://www.eevblog.com/forum/beginners/measuring-battery-voltage-without-consuming-current/
# schematic 09/11
PENDING
-------
- UVCC should be connected directly to VUSB? like as VBUS. -- no harm. Pending
UVCC is needed only when USB is plugged.
But it seems to be no harm even if UVCC is powered when not plugged in.
- MCU at 3.3V(or directly from Lipo)
- Voltage shifter between MCU and switch board
- 5V booster controlled by firmware
- 3.3V regulator controlled by firmware
- use reglator with enable pin
- power saving controlled by firmware
Rev.D Errata
============
2014/09/22
2014/10/22
2014/10/29
2014/10/31
TODO
----
- Solder mask clearance
- Seeed: 0.1mm min width/0.13mm clearance
- Elecrow 5/10pcs: 0.2mm/0.2mm http://www.elecrow.com/2-layer-10cm-10cm-max-pcb-510pcs-color-free-p-328.html
- Elecrow small batch: 0.1mm/0.13mm http://www.elecrow.com/small-batch-of-2-layer-pcbs-50pcs-p-330.html
- OSHPark: not specified https://oshpark.com/guidelines
- Logo
- TMK logo
- Paste layer for stencil
- need to add paste layers on modules
- need to retouch all SMT modules
# PENDING 10/31 will do on future revision :D
- extension pins output
- in addition to PD0 and PD1 for external
- other pins used for BT for internal?
- PD6(LED), PC6,7(JP), PD2,3,4,5,PE6,PF0,1,4,5,6,7(BT)
- and 5V, GND
- for debug(PD0, PD1), for foot pedal, extra key, LED or such?
# PENDING 10/30 not necessity now
DONE
----
- UVCC should be connected directly to VUSB? like as VBUS.
- no harm. how about *power consumption*?
- UVCC is needed only when USB is plugged.
- But it seems to be no harm even if UVCC is powered when not plugged in.
- need patch and test on Rev.D - OK 10/31
# DONE 10/31 With connecting UVCC to VUSB it works without problem
- Light pipe position align
- right one should be closer to edge
- third LED and light pipe on middle between two?
# CANCEL 10/30: They were aligned correctly in Rev.D
- Loose light pipe hole
- smaller holes for LEDs
- check datasheet of light pipe again
# DONE 10/31 use 1.1176/0.044 instead of 0.046
- Pull-down resistor of MOSFET switch instead of pull-up
- for HHKB key switch board power control
- good when power down mode
- curretnt flows to IO port through pull-up is needed to disable switch(0.5mA with 10KOhm pull-up)
- pull up or down resistor? normally on or off?
- difference in power consumption between them?
# CANCEL 10/30 no significant difference
- Lipo voltage divider: leak current
- Lipo -> R17 -> PF0, about 1.3V is supplied even when it turns off
- high side Pch MOSFET switch is needed
- and needs Nch MOSTFET to control gate of Pch
# DONE 10/30: PCB/shecmatic fix
- Idea: Solder jumper inside of PPTC and schotky diode
- to save PCB space jumper can place between lands of the components
- concern of an accidental short circuit?
# DONE 10/30
- MCP73831 leak current from Vdd pin when not powered
- it will need a schotky diode there.
- VBUS of ATMega32U4 pin fails to detect of USB plug in/off event
- LTC4054 doesn't have this problem
- schotky also resolves charge LED problem*
# DONE 10/30 needs a good Vf diode
- MCP73831 charge LED dim lights up when not charging
- MCP73832 has no upside MOSFET: may resolve this?
- schotky diode on vdd of MCP73831 resolve this problem*
# DONE 10/30 use MCP73831 with schottky diode
- MCP73832 test
- charge LED is ok? should not light when not charging
- power LED should not light when not powered(need schotky diode on vdd of charger?)
# DONE 10/30 OK with the schottky fix on Rev.D
- LED for non BT(USB controller)
- using USB hub holes is preferable
- for lock key and layer status
- BT indicators can be used?
- too tight space!
# CANCELED 10/30: HHKB users never mind LED indicators for lock keys.
PATCH for Rev.D PCB
===================
With Rev.D to implements Bluetooth components you better have these fixes. It will work whitout fixes but these will make battery life a little bit longer.
Charger leak Fix
----------------
Without this MCU is powered with leakage current of Lipo charger MCP73831 even when swich is off.
Cut trace which runs from 'NoPPTC' solder jumper to 'PPTC' and place schottky diode on 'PPTC' lands with direction presented in picture.
ADC Switch Fix
--------------
Without this MCU is powered through ADC pin from Lipo battery.
Place components as located in picture.
http://i.imgur.com/EJhoeVUl.jpg
http://i.imgur.com/4MWi1xql.jpg
http://i.imgur.com/sklO4KDl.jpg
http://i.imgur.com/ExQrgwzl.jpg
PENDING
-------
- MCU at 3.3V(or directly from Lipo)
- Voltage shifter between MCU and switch board
- 5V booster controlled by firmware
- 3.3V regulator controlled by firmware
- use reglator with enable pin
- power saving controlled by firmware
- Xtal 8MHz
- confirmed: USART doesn't work at baud rate 115200
- default buad rate of RN-42 is 115200(factory setting)
- power saving effect on MCU is not so drastic
Rev.E Errata
============
2014/12/08
- *** Rev.E BT test *** - DONE
- with MCP73832, new Schottky, tantalum caps - DONE 12/07
* MCP73832 doesn't leak from Vcc pin when unpluged and battery powered
34mV vs 2.07V(MCP73831) at Vcc pin
MCP73832 doesn't need revese protection diode D5
* PMEG2010ER is very low VF while reverse current/voltage is high
VF=0.96 vs 1.98(RB160M-30TR)with Fluke 175
Anode of D11 is 680mV vs 20mV(RB160M-30TR)
780mV is still low < 1.4V VBUS plugin detection(21.11)
this doesn't cause false VBUS detect
and 780mV on MCP73832 Vcc pin is also no problem.
D5 can be removed.
- ADC divider switching - DONE 12/07
* Drain and Source of Q4 Pch was reversed wrongly on Rev.E.
- reverse current from Lipo charger - DONE 12/07
* MCP73832 has no recverse current from Vcc pin unlike MCP73831
- Rev.F design - DONE
- current measure point - DONE 12/08
- change value of cap 68->47 - DONE 12/08
- PPTC land pattern: no solder jumper, use 0Ohm resistor instead - CANCEL 12/08
- Q4 Pch FET: wrong Drain and Source - DONE 12/08
- D5 can be removed. - DONE 12/08
Rev.E Fix
---------
Q4 Pch FET drain and source pins are reversed stupidly in schematic and PCB on this revision.
You need to solder the FET upside down like this, really shame.
http://i.imgur.com/U6UnzaYl.jpg
Rev.F Errata
============
- Poly FUSE foot print
Size up to 3225-3228
Recommended pads are used already, not changed. Solder jumper is removed. 03/09
- GND pin should be connected to just one side due to thermal relief
thin spoke thermal relief is used for reset button 03/09
Rev.G Errata
============
- Reset switch GND pin: remove thermal releif spokes on top side
To make good solder filet
DONE 07/05
Rev.H Errata
============
No Errata.
- USB connector pads
should be lessened to recoomended size?
- Remove C13
not used anymore.
Rev.I Errata
============
No Errata.
- Remove C13
not used anymore.
Rev.J Errata
============
No Errata.
Rev.K Errata
============
No Errata.
Change
------
- Optimize D1 foot print for reflow
- Reverse polarity protection for Lipo battery
- Change R5 value to 1.5K