Hybrid Smartwatch Design Inquiry

flux

Enlarged the PCB from 40 mm circular to 42 mm circular on a 4-layer stackup. This keeps it within the 44 mm case target while improving density from critical to high.
Open items:
  • Routing is still tight, especially around the ESP32/RTC/regulator area.
  • A few passives may still need to move to the bottom layer for clean routing.
Suggested next steps:
  1. Spread the crowded ESP32/RTC/power components.
  2. Move low-profile passives to the bottom side.
  3. Run routing feasibility again before autorouting.
dingusmingus

dingusmingus

the esp doesnt fit

flux

I’ll inspect the ESP32 module placement and board clearance, then move/orient it so the module body and antenna keepout fit within the enlarged round PCB/case constraints.

flux

Fixed the ESP32 fit issue: U1 was protruding past the 42 mm circular board, so I moved it inward. It is now fully inside the PCB outline at approximately (0, 5 mm).
Open items:
  • Moving U1 inward created new routing congestion between U1, U5, J1, and J3.
  • The next placement pass should spread the motor driver/AMOLED connector area and possibly move small passives to the bottom side.
Suggested next steps:
  1. Re-place the crowded U1/U5/J1/J3 cluster.
  2. Move selected passives to the bottom layer.
  3. Run routing feasibility again.
Re-place and check
Re-place crowded cluster
Move passives bottom
Run layout review
Protect antenna keepout
U1
U5
J4
U3 OUT - U1 3V3
U1 EN - R1 P2
U5 BOUT2 - J3 4
U2 BATT - J2 1
U1 IO18 - U5 nFault
U6 VRECT_5 - C12 P1
U1 IO0 - TP5 TP
U4 VBAT - U5 VINT
U2 SYS - U3 IN
U1 IO4 - J1 8
U2 SYS - U3 IN
U1 IO13 - U5 AIN1
U1 IO9 - U4 SDA
J1 12 - U1 IO2
U1 IO10 - U4 SCL
U1 IO15 - U5 BIN1
U3 SW2 - L1 P2
U3 SW1 - L1 P1
U6 VAA - C15 P1
U5 BOUT2 - J3 4
J1 9 - U1 IO20
U1 IO21 - Q1 G
U3 SW2 - L1 P2
U1 IO10 - U4 SCL
U5 AOUT1 - J3 1
U1 IO9 - U4 SDA
U6 COMA2 - C10 P2
U1 IO26 - J1 27
U6 COMA1 - C10 P1
U2 BATT - J2 1
U5 AOUT2 - J3 2
U1 IO15 - U5 BIN1
U2 BATT - J2 1
U6 AC1_4 - J4 1
U6 VAA - C15 P1
U6 BOOT1 - C8 P1
U1 IO6 - J1 6
U4 VBAT - U5 VINT
U6 COMB1 - C11 P1
U3 OUT - U1 3V3
U1 IO10 - U4 SCL
U6 AC1_4 - J4 1
U1 IO12 - U4 ~{INTA}
U1 IO8 - J1 19
U3 SW1 - L1 P1
U1 TXD0 - TP3 TP
U6 VRECT_5 - C12 P1
TP1 TP - U2 IN
U3 OUT - U1 3V3
U3 OUT - U1 3V3
U1 IO1 - J1 14
U1 IO9 - U4 SDA
U5 AOUT1 - J3 1
U1 IO21 - Q1 G
U6 NTC - R9 P2
U1 TXD0 - TP3 TP
U1 IO10 - U4 SCL
D1 1 - R5 P2
U3 OUT - U1 3V3
U6 COMA2 - C10 P2
TP1 TP - U2 IN
U1 IO18 - U5 nFault
U6 BOOT2 - C9 P1
U2 BATT - J2 1
U1 IO19 - J1 7
U1 IO3 - J1 10
U3 OUT - U1 3V3
U1 IO0 - TP5 TP
U1 IO8 - J1 19
U3 OUT - U1 3V3
TP1 TP - U2 IN
U6 COMB1 - C11 P1
U3 OUT - U1 3V3
U6 COMB2 - C11 P2
U5 BOUT1 - J3 3
U3 IN - C5 P1
U1 IO1 - J1 14
U6 BOOT2 - C9 P1
U6 AC2_4 - J4 2
U1 IO9 - U4 SDA
J1 9 - U1 IO20
U1 IO21 - Q1 G
U1 IO9 - U4 SDA
U4 VBAT - U5 VINT
U4 VBAT - U5 VINT
U4 VBAT - U5 VINT
U5 AOUT2 - J3 2
U4 VBAT - U5 VINT
U6 BOOT1 - C8 P1
U6 AC2_4 - J4 2
U2 BATT - J2 1
TP1 TP - U2 IN
U6 IEXT - R8 P1
J1 12 - U1 IO2
U1 IO12 - U4 ~{INTA}
U1 IO17 - U5 nSleep
TP1 TP - U2 IN
U4 VBAT - U5 VINT
U6 AC1_4 - J4 1
U1 IO7 - J1 21
U6 NTC - R9 P2
U1 RXD0 - TP4 TP
U1 IO6 - J1 6
U1 EN - R1 P2
D1 2 - Q1 D
U4 VBAT - U5 VINT
U1 IO11 - U2 INT
U1 IO10 - U4 SCL
U6 NTC - R9 P2
U1 IO10 - U4 SCL
U1 EN - R1 P2
U1 IO5 - J1 4
WLC_ENB
TP1 TP - U2 IN
TP1 TP - U2 IN
U6 COMB2 - C11 P2
D1 2 - Q1 D
U6 INTB - R7 P2
U1 IO19 - J1 7
U4 VBAT - U5 VINT
U6 IEXT - R8 P1
U3 OUT - U1 3V3
U5 BOUT1 - J3 3
U1 IO21 - Q1 G
U1 IO26 - J1 27
U6 VRECT_5 - C12 P1
TP1 TP - U2 IN
U6 AC2_4 - J4 2
U1 IO7 - J1 21
U1 IO13 - U5 AIN1
U1 IO14 - U5 AIN2
U1 IO11 - U2 INT
U1 IO4 - J1 8
U1 IO5 - J1 4
U3 IN - C5 P1
U3 IN - C5 P1
U1 IO0 - TP5 TP
U2 BATT - J2 1
U1 IO16 - U5 BIN2
U1 IO14 - U5 AIN2
U1 RXD0 - TP4 TP
TP1 TP - U2 IN
D1 1 - R5 P2
U1 IO3 - J1 10
U3 OUT - U1 3V3
U1 IO9 - U4 SDA
U1 IO16 - U5 BIN2
U1 IO17 - U5 nSleep
U6 INTB - R7 P2
U6 COMA1 - C10 P1
U3 AGND - U4 VSS
U1 GND - U1 GND
C6 P2 - C7 P2
U3 AGND - U4 VSS
C6 P2 - C7 P2
U3 AGND - U4 VSS
GND
U6 VSSA - C12 P2
U1 GND - U1 GND
U6 VSSA - C12 P2
U1 GND - U1 GND
U1 GND - U1 GND
U1 GND - U1 GND
GND
U3 AGND - U4 VSS
U6 VSSA - C12 P2
U6 VSSA - C12 P2
U1 GND - U1 GND
U3 AGND - U4 VSS
GND
U1 GND - U1 GND
U3 AGND - U4 VSS
U1 GND - U1 GND
U3 AGND - U4 VSS
U1 GND - U1 GND
U1 GND - U1 GND
U3 AGND - U4 VSS
GND
U3 AGND - U4 VSS
U3 AGND - U4 VSS
U6 VSSP_4 - U6 VSSD
U3 AGND - U4 VSS
GND
U1 GND - U1 GND
U6 VSSA - C12 P2
U3 AGND - U4 VSS
U3 AGND - U4 VSS
U1 GND - U1 GND
U1 GND - U1 GND
GND
U3 AGND - U4 VSS
U1 GND - U1 GND
U1 GND - U1 GND
U6 VSSA - C12 P2
U3 AGND - U4 VSS
U1 GND - U1 GND
GND
GND
U1 GND - U1 GND
U6 VSSA - C12 P2
U1 GND - U1 GND
U1 GND - U1 GND
U1 GND - U1 GND
U6 VSSA - C12 P2
U1 GND - U1 GND
U3 AGND - U4 VSS
U1 GND - U1 GND
U6 VSSP_4 - U6 VSSD
U1 GND - U1 GND
U6 VSSA - C12 P2
U1 GND - U1 GND
GND
U1 GND - U1 GND
TP5
C10
Capacitance
100nF
TP6
TP3
C14
Capacitance
1uF
C2
Capacitance
1uF
C11
Capacitance
100nF
C3
Capacitance
22uF
TP2
C7
Capacitance
100nF
C5
Capacitance
10uF
C1
Capacitance
100nF
C8
Capacitance
100nF
C13
Capacitance
10uF
TP1
TP4
C6
Capacitance
10uF
TP7
C12
Capacitance
4.7uF
C15
Capacitance
1uF
C4
Capacitance
10uF
C9
Capacitance
100nF
J1
R7
Resistance
10kΩ
D1
R10
Resistance
100kΩ
R4
Resistance
4.7kΩ
R5
Resistance
100Ω
R3
Resistance
4.7kΩ
U4
R6
Resistance
100kΩ
R8
Resistance
100kΩ
R1
Resistance
10kΩ
R9
Resistance
100kΩ
R2
Resistance
10kΩ
J2
U3
L1
Inductance
2.2uH
D2
J3
U6
U2
Q1
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007-Inspired Hybrid ESP32 Smartwatch thumbnail
A 44 mm 007 First Light-inspired hybrid smartwatch concept using an ESP32-class 2.4 GHz Wi-Fi/BLE module, round AMOLED/OLED display, mechanical real-time hands, rechargeable battery, sealed charging, and a red strap-mounted laser feature.

Layout Rules

mm

Yes

10mm

Top

deg

Properties

Pricing & Availability

Distributor

Qty 1

Arrow

$4.97–$6.51

Digi-Key

$11.07

HQonline

$0.14

LCSC

$12.81–$12.88

Mouser

$14.12

TME

$0.00

Verical

$3.32–$33.58

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