BOM-DAT/capacitor-dat/2026-03-04-20-26-20.png
... ...
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BOM-DAT/capacitor-dat/capacitor-dat.md
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@@ -218,6 +218,9 @@ The capacitor blocks DC from the source, letting only the AC audio signal pass.
218 218
- Non-precision timing circuits
219 219
220 220
221
+## decouple
222
+
223
+![](2026-03-04-20-26-20.png)
221 224
222 225
223 226
## ref
Chip-dat/Nordic-dat/NRF5x-dat/NRF52832-dat/NRF52832-dat.md
... ...
@@ -24,7 +24,9 @@ debug connector
24 24
25 25
![](2026-03-04-19-59-30.png)
26 26
27
-SWDIO / SWDCLK / P0.18 / reset
27
+SWDIO (pad) / SWDCLK (pad) / P0.18 == SWO / P0.21 == reset
28
+
29
+P0.22 == FRST (pad)
28 30
29 31
module MDBT 42
30 32
Chip-dat/Nordic-dat/NRF5x-dat/NRF52840-dat/2026-03-04-20-22-25.png
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Chip-dat/Nordic-dat/NRF5x-dat/NRF52840-dat/NRF52840-dat.md
... ...
@@ -141,6 +141,46 @@ Adafruit Feather nRF52840:
141 141
- SDA: P0.25 (Physical Pin 25)
142 142
- SCL: P0.26 (Physical Pin 26)
143 143
144
+
145
+external QSPI flash
146
+
147
+- [[flash-dat]]
148
+
149
+- QSPI DATA0 -- PO.17
150
+- QSPI SCK -- P0.19
151
+- QSPI DATA3 -- PO.21
152
+- QSPI CS -- PO.20
153
+- QSPI DATA2 -- P0.23
154
+- QSPI DATA1 -- PO.22
155
+
156
+peripherals - [[peripherals-dat]]
157
+
158
+- Switch P1.02 BUTTON
159
+- Reset P0.18 BUTTON
160
+
161
+- LED1 P1.15
162
+- LED2 P1.10
163
+- WS2812 P0.16
164
+
165
+- VDIV P0.29
166
+
167
+- SCK P0.14
168
+- MOSI P0.13
169
+- MISO P0.15
170
+
171
+- SWO P1.00
172
+
173
+- RXD P0.24
174
+- TXD P0.25
175
+
176
+- P0.09 NF1
177
+- P0.10 NF2
178
+
179
+- P0.11 SCL
180
+- P0.12 SDA
181
+- P0.09 NFC / P0.10 NFC
182
+
183
+
144 184
## solutions and apps
145 185
146 186
- [[NRF52840+SX1262-dat]] - [[lora-dat]] - [[bluetooth-dat]]
... ...
@@ -151,6 +191,7 @@ Adafruit Feather nRF52840:
151 191
152 192
## NRF52840 SCH
153 193
194
+### SCH1
154 195
155 196
![](2025-07-09-12-46-39.png)
156 197
... ...
@@ -161,14 +202,22 @@ Adafruit Feather nRF52840:
161 202
- BAT_ADC == P0.04
162 203
- SPI == P1.12 ~ P1.15
163 204
164
-## SCH2 Module
205
+### SCH2 Module
165 206
166 207
![](2025-07-09-15-30-56.png)
167 208
168 209
210
+### SCH3 module
211
+
212
+![](2026-03-04-20-22-25.png)
213
+
169 214
170 215
## ref
171 216
172 217
- [[bluetooth-dat]] - [[nrf52840]]
173 218
174
-- [[nordic-dat]]
... ...
\ No newline at end of file
0
+- [[nordic-dat]]
1
+
2
+- [[flash-dat]]
3
+
4
+- [[protection-dat]] - [[capacitor-dat]]
... ...
\ No newline at end of file
Circuits-dat/protection-dat/protection-power-dat/2026-03-04-20-24-02.png
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Circuits-dat/protection-dat/protection-power-dat/protection-power-dat.md
... ...
@@ -34,6 +34,9 @@
34 34
35 35
36 36
37
+## reversed protection
38
+
39
+![](2026-03-04-20-24-02.png)
37 40
38 41
39 42
## inrush protection
Tech-dat/memory-dat/flash-dat/2026-03-04-20-27-04.png
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Tech-dat/memory-dat/flash-dat/flash-dat.md
... ...
@@ -43,8 +43,14 @@ S29GL128P90TFIR10 - NOR Flash 128Mb 3V 90ns Parallel NOR Flash
43 43
44 44
- flash with bypass button
45 45
46
+- QSPI
47
+
46 48
![](2025-10-08-15-52-28.png)
47 49
50
+data bit 0~3
51
+
52
+![](2026-03-04-20-27-04.png)
53
+
48 54
49 55
## SPI NAND
50 56