N58 Open CPU Platform » Gateway 3.0

Carrier Board
Dhilip is working
Schematic completed - update fab sheet

Layout - re-do placement with consideration of isolation
Venumadhav to proceed for mech fab - intefrate step file, decide SIM holder, reset and other ext. interfaces

Complete placement today, complete routing by Thursday night

release gerber for fab by Friday

Resmi - guidance in PCB deign, design study, design doc revision, isolation req., constraints, orthogonal routing, multiple vias,

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Production version - Bhavani doing
Schematic completed, add GPIO for LEDS, fab details

update and share Prog. model,
study N58 datasheet for GPIO, unterminated pins(get from Venumadhav), VBAT requirements(super cap life)
all pins must be terminated with net or no connect
update DDD
use required doc, design in printout
EVK SS+pad , gerber to understand reference layout
complete ext. interfaces by tom and review, suggest alternatives
proceed for placements, refer existing designs and docs
use EVK schematic print in readable
USB - TYpe A preferred - N58 flashing and USB config tool
decide ISOlation for serial communication

Update all work in respective Redmine tasks

Discussion points

1. if weighing scale/temp/battery data not available with device powered on, how does this status conveyed to cloud ?
2. Sending 0 is not an option, use ERROR codes
3. program memory - used/free
4. data memory - used/free
5. software version ?
6. if the n/w is not available at the time of device powered on, how does time stamp is added to the buffered data(60 records)
7. what is the RTC backup time
8. RTC is synced immediately after every 12.00am from NTP
9. is RTC battery powered ?
10. if clients cloud server is down, how does this indicate locally on device LED ?
11. 10s interval data posting for 60 records => 10 minutes of data
12. How much time does it take to flush 60 records
13. is it in one TCP packet or individual packets?
14. what is the inter packet delay ?
15. status LED for
16. if no network ?
17. if no TCP connection ?
18. what network status are indicated through LED ?
19. USB tool parameter list document ?
20. LED indication
21. Power ON
22. Network available/not available
23. TCP ERROR/Success
24. Modbus status
25. Weighing scale data availability
26. What is the weighing updates?
27. 0.1sec
28. post data = summed value/no. of samples
29. what is temperature/ battery sampling time ?
30. once per one posting ? - yes
31. Connect LEDs and test?
32. programming model document ?
33. OTA ?
34. RSSI ? is it in data packet ?
35. Any Alerts data type other than Error status in posted packet ?
36. Email (SNMP) / SMS / MQTT
37. SIM subscription status ?
38. Security features - TLS ?
39. Is it Sync with Redmine tasks ? If not update status, add new if required
40. What is the 4G data transmission time for one TCP packet ?
41. Modbus reading time? any timeout error? Is the logic same as implemented in Chola gateway ?
42. SIM insertion/removal/invalid - status indications ?
43. Reset / brownout
44. Console debug/log facility

N58 production design - GW3.1

1. PCB Design
   a. N58 PCB Design
   b. N58 PCB Fab
   c. Connector PCB - ISO Buck Module - 1L PCB, use TH comp on top side, smd comp bottom, routing on bottom, inevitable routing on top for the purpose of jumper connections in orthogonal
   d. Connector PCB fab - Kerala or Devi, not ENIG, HASL

2. Update Programming model doc

3. Update Power budget

4. PCB fab spec. sheet for both PCBs - use template, dont mention fabricator name

5. BoM for both PCBs and LED PCB
   a. Stacking height - 20mm, 15mm, add complete spec of connector in the respective BoM
   b. Relimate connector for LED PCB - add in N58 PCB BoM the mating cable, specify cable length
   c. Relimate connector male - add in LED PCB BoM

6. Mech Fab design consists of
   a. N58 PCB
   b. Connector PCB - ISO Buck Module
   c. LAN Module
   d. LED PCB
   e. enclosure lid and base
   f. Stacking height - 20mm from connector PCB, 15mm from LAB module(upside down)

g. Complete step file upload in autodesk viewer for review
h. Generate mech fab design
i. Initiate mech fab
j. buy enclosure
k. decide qty - suggest 5 nos, discuss with Venu sir

7. Screen Print design
8. Component purchase/get stock
9. Plan for PCB Assembly
10. TPP
11. Update Product Specification document

N58 production design - GW3.0

N58 EVK + Carrier board

1. Component purchase
   a. Order long header for 20mm stacking
   b. Relimate connector set for LED PCB
   c. PCB Stacking
   d. Packing inside enclosure
2. Photographs
   a. Assembled PCB carrier PCB, LED PCB and EVK top and bottom individually
   b. Stacked PCB top and side
   c. After box assembly, with lid open and placed adjascent, top view
   d. After box closed, all 5 faces view from top, off-white background