diff options
| author | Kévin Redon <kredon@sysmocom.de> | 2019-09-03 20:33:48 +0200 |
|---|---|---|
| committer | Kévin Redon <kredon@sysmocom.de> | 2019-09-03 20:33:57 +0200 |
| commit | 614ce7a7d83798109d90f6997696212387900526 (patch) | |
| tree | 38a1d8015f4ce7fec3c44f0618c25679f040669e | |
| parent | af693b2ee0869f81f7a8fef8c4143092ebaeeb4c (diff) | |
schematic: mark R19 as dot no place
R19 pulls VCC_PHONE low for better power on detection.
but the voltage divider R20 + R21 also pull this line low using
a stronger pull down resistor ok 20 kOhm.
thus R19 is unnecessary-
this change has been tested with a real simtrace device.
trace and card emulation worked with a Nokia 3310.
Change-Id: I0dd2025a8634f0ec38060cfbaae68618a4198fca
| -rw-r--r-- | hardware/kicad/SIMtrace.sch | 2 | ||||
| -rw-r--r-- | hardware/pcb/schema/SIMtrace.pdf | bin | 121415 -> 121547 bytes |
2 files changed, 2 insertions, 0 deletions
diff --git a/hardware/kicad/SIMtrace.sch b/hardware/kicad/SIMtrace.sch index 1ed2d15..e06df55 100644 --- a/hardware/kicad/SIMtrace.sch +++ b/hardware/kicad/SIMtrace.sch @@ -321,6 +321,8 @@ F 0 "R19" H 9300 6100 50 0000 C CNN F 1 "100K" H 9300 6000 50 0000 C CNN F 2 "SM0603" H 9450 6000 60 0001 C CNN F 3 "" H 9450 6000 60 0001 C CNN +F 4 "DNP" H 9300 5900 50 0000 C CNN "Place" +F 5 "R20 and R21 already pull VCC_PHONE low" H 9450 6000 50 0001 C CNN "Note" 1 9450 6000 1 0 0 -1 $EndComp diff --git a/hardware/pcb/schema/SIMtrace.pdf b/hardware/pcb/schema/SIMtrace.pdf Binary files differindex f499167..bad3673 100644 --- a/hardware/pcb/schema/SIMtrace.pdf +++ b/hardware/pcb/schema/SIMtrace.pdf |