Novena PVT2 ECO List
This is a list of all the changes applied to the board from PVT1 to PVT2 (Crowd Supply initial campaign) release. If it's not on this list, it didn't happen.
Each change has the format of issue summary/resolution, and specific change
Contents
ECO1: Improve HPD margin
HPD on i.MX6 has a low impedance (10k). This causes marginal HPD performance on some boards. Make R29L stronger.
| PVT1 | PVT2 | Notes |
|---|---|---|
| R29L 10k, 1% / REC1005N | R29L 1k, 1% | HDMI HPD perforance |
ECO2: EOL issue U11D
STMPE610 is EOL. Switch to STMPE811, pin-compatible and not EOL.
| PVT1 | PVT2 | Notes |
|---|---|---|
| U11D STMPE610 | U11D STMPE811QTR | resolve EOL issue |
ECO3: EOL issue audio amplifier
NS4890 is EOL. Replace with compatible NS4890B in two places.
| PVT1 | PVT2 | Notes |
|---|---|---|
| U10A, U12A NS4890 | U10A, U12A NS4890B | resolve EOL issue |
ECO4: Improve kernel panic logging
U10S is too small for good kernel panic logging. Replace with larger capacity I2C EEPROM to store several crashes worth of logs.
| PVT1 | PVT2 | Notes |
|---|---|---|
| U10S 24LC32A-I/ST | U10S FT24C512AUTR-T | improve KP logging |
ECO5: 47uF 1206 capacitor is wrong AGAIN
The wrong package type (1210) is being ordered for this 1206 part. This was supposed to be corrected on PVT1. Please double-confirm that instruction is understood that this part cannot be substituted with a 1210 footprint.
| DVT and PVT1 | PVT2 | Notes |
|---|---|---|
| C43M 47uF, 6.3V, 20% X5R | 47uF, 6.3V, 20% X5R (CL31A476MQHNNNE) | double-confirm this change is understood! |
| C44M 47uF, 6.3V, 20% X5R | 47uF, 6.3V, 20% X5R (CL31A476MQHNNNE) | |
| C45M 47uF, 6.3V, 20% X5R | 47uF, 6.3V, 20% X5R (CL31A476MQHNNNE) | |
| C18M 47uF, 6.3V, 20% X5R | 47uF, 6.3V, 20% X5R (CL31A476MQHNNNE) | |
| C52C 47uF, 6.3V, 20% X5R | 47uF, 6.3V, 20% X5R (CL31A476MQHNNNE) |
ECO6: Upgrade accelerometer
Old accelerometer is probably approaching EOL.
MMA8452Q is stocked at 3mm+ levels in the factory and has existing Linux drivers in main-line. A little more expensive than MMA8653FC, but twenty cents is not going to kill this product. So, we go with MMA8452Q.
| PVT1 | PVT2 | Notes |
|---|---|---|
| U10D MMA7455L | U10D MMA8452Q | improve accelerometer, avoid EOL |
| R17D 20k, 1% | removed | INT output is now push/pull |
ECO7: Upgrade FAN53540UCX
FAN53540UCX marked as not recommended for new designs.
FAN53541UCX is a pin-compatible upgrade. Difference between the two is that the enable and mode input no longer need 1k ballast resistors. However, leaving them in place causes no harm and allows for downgrade compatibility in case parts are in short supply.
| PVT1 | PVT2 | Notes |
|---|---|---|
| U13N FAN533540UCX | U13N FAN53541UCX |
ECO8: Update i.MX6 P/N
Previously schematic listed the 1.0GHz P/N as the default. Updated to reflect the plan to only produce with the 1.2GHz P/N.
| PVT1 | PVT2 | Notes |
|---|---|---|
| U100 iMX6Q - PCIMX6Q5EVT10AD | U100 iMX6Q - MCIMX6Q5EYM12AC |
ECO9: Confirm change of D10C
Measurements on diode leakage indicate D10C was not properly updated on BOM at last ECO. Confirm factory received ECO update.
| DVT/PVT1 | PVT2 | Notes |
|---|---|---|
| D10C NSR0320 | D10C RB751V40,115 | Reduce leakage from 1mA max to 0.0005mA max; peak If = 120mA, but max current on stby line is ~1mA |
ECO10: U12N is EOL
U12N, the lower synchronous switch of the 5V converter, has gone EOL. Replace with recommended substitute by On Semi.
The recommended substitute NTMFS4C35NT1G is pin-compatible. It has a slightly lower power rating due to a higher Tj to the case, but the RdsON is the same. The converter is actually highly over-spec'd for the measured loads, so this substitution is not a problem. In fact, the substitute may improve efficiency slightly as the gate charge and other parasitics of the new device are lower.
| DVT/PVT1 | PVT2 | Notes |
|---|---|---|
| U12N NTMFS4935NT1G | U12N NTMFS4C35NT1G |
