Chip-dat/Microchip-dat/2025-09-04-21-47-57.png
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Chip-dat/Microchip-dat/microchip-dat.md
... ...
@@ -13,9 +13,15 @@ MCP1253 == Low Noise, Positive-Regulated Charge Pump
13 13
14 14
15 15
16
+## fan control
16 17
18
+EMC2301/2/3/5
17 19
20
+Single/Multiple RPM-Based PWM Fan Controller
18 21
22
+![](2025-09-04-21-47-57.png)
23
+
24
+- TACH 1 == Tach 1 Input
19 25
20 26
21 27
## ref
Circuits-dat/circuits-dat.md
... ...
@@ -1,6 +1,10 @@
1 1
2 2
# circuits-dat
3 3
4
+- [[protection-dat]]
5
+
6
+
7
+
4 8
- [[MMA7660-dat]] - [[SD-card-dat]]
5 9
6 10
- [[mosfet-dat]] - [[logic-gate-dat]]
... ...
@@ -23,3 +27,4 @@
23 27
24 28
## ref
25 29
30
+- [[tech-dat]]
... ...
\ No newline at end of file
Circuits-dat/protection-dat/ESD-dat/ESD-dat.md
... ...
@@ -0,0 +1,11 @@
1
+
2
+# ESD-dat
3
+
4
+- [[USB-ESD-dat]]
5
+
6
+- [[ethernet-ESD-dat]] - [[ethernet-dat]]
7
+
8
+
9
+- [[ethernet-ESD-dat]]
10
+
11
+TPD4EUSB30
... ...
\ No newline at end of file
Circuits-dat/protection-dat/current-limit-dat/current-limit-dat.md
... ...
@@ -0,0 +1,4 @@
1
+
2
+# current-limit-dat
3
+
4
+- [[diodes-dat]]
... ...
\ No newline at end of file
Circuits-dat/protection-dat/power-protection-dat/power-protection-dat.md
... ...
@@ -6,6 +6,8 @@
6 6
7 7
- [[protection-dat]]
8 8
9
+- [[power-protection-Vmotor-dat]]
10
+
9 11
10 12
## Power Protection
11 13
Circuits-dat/protection-dat/protection-dat.md
... ...
@@ -1,10 +1,22 @@
1 1
2 2
# protection-dat
3 3
4
-- [[power-protection-dat]] - [[signal-protection-dat]]
4
+- [[power-protection-dat]]
5
+
6
+- [[power-protection-Vmotor-dat]]
7
+
8
+
9
+- [[signal-protection-dat]]
5 10
6 11
- [[USB-ESD-dat]]
7 12
13
+- [[battery-protection-dat]]
14
+
15
+- [[current-limit-dat]]
16
+
17
+- [[ESD-dat]]
18
+
19
+
8 20
9 21
10 22
## board
PCB-dat/PCB-dat/EDA-dat/kicad-dat/kicad-dat.md
... ...
@@ -11,9 +11,22 @@
11 11
12 12
- [[kicad-simulation-dat]]
13 13
14
+- [[kicad-sch-dat]] - [[kicad-pcb-dat]]
14 15
15 16
16 17
18
+## files
19
+
20
+- .kicad_pro - project file
21
+- .kicad_sch - schematic file
22
+- .kicad_pcb - PCB layout file
23
+- .kicad_sym - symbol library file
24
+- .kicad_mod - footprint library file
25
+- .dcm - documentation file
26
+- .wrl - 3D model file
27
+- .pretty - folder for footprint libraries
28
+
29
+
17 30
## Glossary
18 31
19 32
### DCM = documentation file
PCB-dat/PCB-dat/EDA-dat/kicad-dat/kidcad-workflow-dat/kicad-sch-dat/kicad-sch-dat.md
... ...
@@ -3,6 +3,25 @@
3 3
4 4
5 5
6
+- [[kicad-symbol-dat]]
7
+
8
+
9
+## shortcut
10
+
11
+- D == datasheet
12
+- G == drag
13
+- M == move
14
+- R == rotate
15
+
16
+
17
+## add new hierarchy sheet
18
+
19
+- click tool icon - draw hierarchy sheets
20
+
21
+
22
+
23
+
24
+
6 25
### add symbol
7 26
8 27
- search based on components type and footprint
... ...
@@ -33,3 +52,9 @@
33 52
- add symbols and assign footprint
34 53
- enter "E" for properties, and assign the footprint
35 54
55
+
56
+
57
+## ref
58
+
59
+- [[kicad-dat]]
60
+
Tech-dat/ESD-dat/ESD-dat.md
... ...
@@ -1,11 +0,0 @@
1
-
2
-# ESD-dat
3
-
4
-- [[USB-ESD-dat]]
5
-
6
-- [[ethernet-ESD-dat]] - [[ethernet-dat]]
7
-
8
-
9
-- [[ethernet-ESD-dat]]
10
-
11
-TPD4EUSB30
... ...
\ No newline at end of file
Tech-dat/Interface-dat/USB-dat/USB-Hub-dat/USB-Hub-dat.md
... ...
@@ -3,7 +3,7 @@
3 3
4 4
- [[microchip-dat]]
5 5
6
-
6
+- [[diodes-dat]] - [[power-protection-dat]]
7 7
8 8
9 9
## FE1.1
Tech-dat/RTC-dat/2025-09-04-21-44-26.png
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Tech-dat/RTC-dat/rtc-dat.md
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@@ -1,10 +1,13 @@
1 1
2
-# RTC DAT
2
+# RTC-DAT
3 3
4 4
Boards
5 5
6 6
- [[MOT1007-dat]] - [[MOT1032-dat]]
7 7
8
+
9
+
10
+
8 11
## chip
9 12
10 13
Dallas
... ...
@@ -21,10 +24,31 @@ NXP
21 24
BL
22 25
23 26
24
-NXP
27
+- [[NXP-dat]]
28
+
29
+
25 30
PCF8563T/5,518
26 31
32
+## SCH
33
+
34
+INT and wakeup
35
+
36
+- [[PCF85063-dat]]
27 37
38
+https://www.nxp.com/docs/en/data-sheet/PCF85063A.pdf
39
+
40
+Tiny Real-Time Clock/Calendar with Alarm Function and I2C-Bus
41
+
42
+![](2025-09-04-21-44-26.png)
43
+
44
+- RTC alarms can be used to wake up the Compute module
45
+- NB an Alarm triggering while already awake will cause a reset
46
+- This can be used as a watchdog reset
47
+
48
+The above circuit generates a pulse for GLOBAL_EN when nRTC_INT goes low
49
+
50
+GLOBAL_EN needs to be pulse low for >1mS
28 51
29 52
## ref board
53
+
30 54
[[MPC1073-DAT]]
... ...
\ No newline at end of file
Tech-dat/SBC-dat/RPI-dat/RPI-HDK-dat/RPI-CM4-dat/RPI-CM4-dat.md
... ...
@@ -25,6 +25,13 @@ CM4 also has GPIOs 44&45 from Bank 1 exposed for the I2C bus normally connected
25 25
default UARTs: https://forums.raspberrypi.com/viewtopic.php?t=345086
26 26
27 27
28
+## memory
29
+
30
+✅ So, whether the CM4 has on-module eMMC depends on the exact SKU you buy.
31
+
32
+- If you see "Lite" → no eMMC.
33
+- If not "Lite" → it has 8/16/32 GB eMMC soldered on the module.
34
+
28 35
29 36
30 37
## Specs
Tech-dat/SBC-dat/RPI-dat/RPI-HDK-dat/RPI-CM4-expansion-board-dat/2025-09-04-21-33-14.png
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Tech-dat/SBC-dat/RPI-dat/RPI-HDK-dat/RPI-CM4-expansion-board-dat/RPI-CM4-expansion-board-dat.md
... ...
@@ -9,6 +9,41 @@
9 9
10 10
![](2023-10-27-16-53-47.png)
11 11
12
+diagram
13
+
14
+![](2025-09-04-21-33-14.png)
15
+
16
+- USB2_HUB
17
+ - nEXTRST
18
+ - USB2_P
19
+ - USB2_N
20
+ - USBOTG
21
+- CM4_HighSpeed
22
+ - GPIO_VREF
23
+ - CAM_GPIO
24
+ - TV_OUT
25
+ - ID_SD (cam/display)
26
+ - IS_SC (cam/display)
27
+- PCIe-connector
28
+- RTC, wakeup, fan
29
+ - SDA
30
+ - SCL
31
+ - global_EN
32
+- CM4_GPIO
33
+ - GPIO_VREF
34
+ - CAM_GPIO
35
+ - TV_OUT
36
+ - ID_SD (cam/display)
37
+ - IS_SC (cam/display)
38
+- PSUs
39
+
40
+
41
+- [[kicad-dat]]
42
+
43
+
44
+
45
+
46
+
12 47
#### Functions
13 48
14 49
![](2024-11-22-19-26-09.png)
... ...
@@ -79,9 +114,9 @@
79 114
80 115
## ref
81 116
82
-- [[diodes-dat]] - [[richtek-dat]]
117
+- [[diodes-dat]] - [[richtek-dat]] - [[RTC-dat]]
83 118
84
-- [[power-protection-dat]]
119
+- [[power-protection-dat]] - [[fan-dat]]
85 120
86 121
- [[USB-hub-dat]] - [[USB-switch-dat]]
87 122
Tech-dat/application-dat/fan-dat/fan-dat.md
... ...
@@ -2,6 +2,15 @@
2 2
# fan-dat
3 3
4 4
5
+
6
+## small fan control
7
+
8
+- [[RPI-CM4-expansion-board-dat]]
9
+
10
+- [[microchip-dat]]
11
+
12
+
13
+
5 14
### Summary of PC Case Fan Types Based on Wiring
6 15
7 16
- **2-Pin Fans**: Fixed-speed fans without monitoring or control features. Used in basic or low-cooling scenarios and is the most affordable option.
Tech-dat/tech-dat.md
... ...
@@ -5,6 +5,8 @@
5 5
6 6
- [[board-dat]]
7 7
8
+- [[circuits-dat]]
9
+
8 10
- [[chip-dat]] - [[chip-cn-dat]]
9 11
10 12
- [[EDA-simulation-dat]] - [[EDA-dat]]