ESP8685H4 Part Review

flux

Completed the ESP8685H4 part review and saved the detailed findings in ESP8685H4 Part Review.
Open items:
  • Datasheet URL was already populated, so I did not overwrite it; however, it is a Mouser mirror, and the official Espressif PDF is preferable.
  • Main mismatch: pin 29 is labeled EP in Flux but is GND in the datasheet.
  • Pin descriptions are missing and all pin types are currently Unspecified.
  • I filed an internal part-quality report for these metadata issues.
Suggested next steps:
  1. Rename pin 29 to GND or GND/EP.
  2. Add datasheet-backed Pin Description and Pin Type metadata.
  3. Change package naming to QFN28 (4x4 mm).
  4. Replace the distributor datasheet URL with the official Espressif URL if you want canonical sourcing.
A

adrian95

Fix pin 29 to GND/EP and add datasheet-backed pin descriptions and pin types.

flux

I’ll update the terminal metadata from the Espressif pin table: rename pin 29 to GND/EP, set pin types, and add concise datasheet-backed pin descriptions, then verify the changes.

flux

Pin 29 is now labeled GND/EP; I’m applying the datasheet pin descriptions and electrical pin types next.

flux

Completed and verified the pin metadata update.
Open items:
  • None for this request.
Suggested next steps:
  1. Optionally update the Datasheet URL to the official Espressif PDF.
  2. Optionally change package metadata to QFN28 (4x4 mm).
  3. Optionally refine part type/subtype from generic logic IC to wireless MCU/RF SoC.
Update metadata and review
Update datasheet URL
Fix package metadata
Refine part subtype
Run final review
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Files

Pins

Symbol

Layout

3D View

XTAL_N
Pin Number
25
XTAL_P
Pin Number
26
GPIO18
Pin Number
21
VDD_SPI
Pin Number
18
LNA_IN
Pin Number
1
GPIO9
Pin Number
15
VDDA_2
Pin Number
28
GPIO19
Pin Number
22
XTAL_32K_P
Pin Number
4
GPIO10
Pin Number
16
VDDA_1
Pin Number
27
CHIP_EN
Pin Number
7
U0RXD
Pin Number
23
NC_2
Pin Number
20
XTAL_32K_N
Pin Number
5
GND
Pin Number
29
VDD3P3_CPU
Pin Number
17
VDD3P3_2
Pin Number
3
VDD3P3_1
Pin Number
2
GPIO2
Pin Number
6
U0TXD
Pin Number
24
NC_1
Pin Number
19
Name
Pin #
Type
Section
Pin Group
Orientation
Order
Sub-symbol
Pin Description
LNA_IN
1
Bi-Directional
RF input and output.
VDD3P3_1
2
Power In
Top
Analog power supply.
VDD3P3_2
3
Power In
Top
Analog power supply.
XTAL_32K_P
4
Bi-Directional
GPIO0, ADC1_CH0, XTAL_32K_P; VDD3P3_RTC power domain.
XTAL_32K_N
5
Bi-Directional
GPIO1, ADC1_CH1, XTAL_32K_N; VDD3P3_RTC power domain.
GPIO2
6
Bi-Directional
GPIO2, ADC1_CH2, FSPIQ; VDD3P3_RTC power domain.
CHIP_EN
7
Input
Chip enable input; High enables chip, Low powers off. Do not leave floating.
GPIO3
8
Bi-Directional
GPIO3, ADC1_CH3; VDD3P3_RTC power domain.
MTMS
9
Bi-Directional
GPIO4, ADC1_CH4, FSPIHD, MTMS; VDD3P3_RTC power domain.
MTDI
10
Bi-Directional
GPIO5, ADC2_CH0, FSPIWP, MTDI; VDD3P3_RTC power domain.
VDD3P3_RTC
11
Power In
Top
Input power supply for RTC.
MTCK
12
Bi-Directional
GPIO6, FSPICLK, MTCK; VDD3P3_CPU power domain.
MTDO
13
Bi-Directional
GPIO7, FSPID, MTDO; VDD3P3_CPU power domain.
GPIO8
14
Bi-Directional
GPIO8; VDD3P3_CPU power domain.
GPIO9
15
Bi-Directional
GPIO9; VDD3P3_CPU power domain.
GPIO10
16
Bi-Directional
GPIO10, FSPICS0; VDD3P3_CPU power domain.
VDD3P3_CPU
17
Power In
Top
Input power supply for CPU IO.
VDD_SPI
18
Power In
Top
VDD_SPI power pin for internal use only.
NC_1
19
Not Connected
No connect.
NC_2
20
Not Connected
No connect.
GPIO18
21
Bi-Directional
GPIO18, USB_D-; VDD3P3_CPU power domain.
GPIO19
22
Bi-Directional
GPIO19, USB_D+; VDD3P3_CPU power domain.
U0RXD
23
Bi-Directional
GPIO20, U0RXD; VDD3P3_CPU power domain.

ESP8685H4