Eval » Historie » Version 15
Maximilian Seesslen, 07.04.2022 14:02
| 1 | 1 | Maximilian Seesslen | h1. Eval |
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| 3 | h2. Hardware |
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| 5 | Display: WSH-12561; 37,32x31,8; 200x200Pixel; eval board funktioniert |
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| 6 | Akku: 31063 (Garmin Fenix 3) 300mAh; 300 mAh; 31,6 x 24,8 x 4,3 |
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| 8 | h2. MCU |
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| 10 | Pixel-data is 5KB ((200*200)/8); need bigger MCU; but the STM32L433CCU6 i have is too much |
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| 12 | STM32L433CCU6: Too much |
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| 13 | 4 | Maximilian Seesslen | STM32L151C6U6A waers eigentlich. USB, -128KB Flash, 32KB SRAM-, EEPROM 32KB Flash, 10KB RAM, hat USB |
| 14 | 1 | Maximilian Seesslen | STM32L051C8T6; no USB |
| 15 | 4 | Maximilian Seesslen | STM32L053C8T6; 11,60Euro, whatt? |
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| 17 | STM32L151C6U6A hab ich schon "hier":http://hase.seesslen.net/redmine/projects/hw-temprec/wiki/STM32#Warehouse. STM32L151CB gibts auch noch, wenn auch teure 12.15Euro. |
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| 18 | 6 | Maximilian Seesslen | Check the binary size. Along with USB. |
| 19 | 7 | Maximilian Seesslen | * Fonts, USB, Terminal, Debug, LUT: 29616 |
| 20 | * Fonts, USB, Terminal, RelWIthDebug, LUT: 22884 |
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| 21 | 4 | Maximilian Seesslen | |
| 22 | Alphabet: 22 Zeichen * 8 Bytes= 176 Bytes. Display-Content 5000 Bytes. |
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| 23 | 8 | Maximilian Seesslen | 32KByte koennten reichen. Versions on Display optional. |
| 24 | 1 | Maximilian Seesslen | 4KByte EEPROM fuer Settings. |
| 25 | 8 | Maximilian Seesslen | |
| 26 | 2 | Maximilian Seesslen | h2. Power |
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| 28 | Lade-Chip: https://www.mouser.de/datasheet/2/268/MCP73871_Data_Sheet_DS20002090F-2932254.pdf |
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| 29 | VCI wants 3V3. VDDIO may be less but is not specified. Reference schematics connects VDDIO directly to VCI. |
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| 30 | Start with 3V3. |
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| 31 | 3 | Maximilian Seesslen | |
| 32 | 1 | Maximilian Seesslen | "ad_mcp73871" is getting manufactured. Lets see how it behaves on V_OUT. |
| 33 | 9 | Maximilian Seesslen | |
| 34 | 12 | Maximilian Seesslen | V_OUT is ok. But there is on discharge protection. Additional chip needed like: |
| 35 | * AP9211; normal 3.0μA (Typ.), 4.5μA (Max.); Power-Down 0.1μA |
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| 37 | 14 | Maximilian Seesslen | "Chip":https://www.tme.eu/de/katalog/batterie-u-akku-controller-schaltungen_112884/?s_field=1000014&s_order=asc&limit=20¤cy=EUR&products_with_stock=1&page=1 |
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| 41 | 9 | Maximilian Seesslen | h2. Open points |
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| 43 | MCU: 1.65 V to 3.6 V power supply, would need LDO. Would need this self-holding-mosfet chain. Would need seperate battery for RTC. MCU has not VBAT. |
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| 44 | 10 | Maximilian Seesslen | There are low IQ LDOs. "((48*1000)/1,6) / 24 / 356" = 3,511236 years. |
| 45 | 11 | Maximilian Seesslen | ADC can also be connected directly. Stop working at 3V. There is no "Low-Battery" signal on the ordered revision of the MCP73871. |
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| 47 | h2. Tests |
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| 48 | |||
| 49 | * Run with Battery < 3V; |
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| 50 | 15 | Maximilian Seesslen | ** -Is Shutdown of MCP73871 working- No, need additional part. |
| 51 | 11 | Maximilian Seesslen | ** Is Low-Battery-Detection implemented on STM32 working? |