| 378 | | === GW2388 === |
| 379 | | |
| 380 | | Please see GW2388 User Manual and view revision notes at the end. |
| 381 | | |
| 382 | | Please contact support |
| 383 | | |
| | 378 | == GW2388-4 == |
| | 379 | === Revision A === |
| | 380 | Date: 12/09 |
| | 381 | * Initial Release |
| | 382 | |
| | 383 | === Revision B === |
| | 384 | Date: 05/10 |
| | 385 | |
| | 386 | * Improve GSC battery circuit to increase battery life |
| | 387 | * Add core buck regulator power sequencing for reliable power up |
| | 388 | * Add VTT generator capacitance to reduce output ripple |
| | 389 | * Correct SATA connector footprint and adding optional SATA power connector |
| | 390 | * Replace through hole DB9 connector with surface-mount connector for improved manufacturing |
| | 391 | |
| | 392 | === Revision C === |
| | 393 | Date: 12/10 |
| | 394 | * Change watchdog timer circuit to ensure narrow pulse width generates reset |
| | 395 | * Add ARM processor digital I/O control of USB voltage generator |
| | 396 | * Add GW16038 mounting hole for increased mechanical retention |
| | 397 | * Add fifth GW2388 mounting hole near center of board for increased stability in high vibration environment |
| | 398 | * Add support for micro SD card detection signal |
| | 399 | * Add optional USB header under USB panel jack for optional external connector mounting |
| | 400 | * Add series resistor to the GPS receiver antenna power signal to remove possibility of circuit damage in response to an antenna short |
| | 401 | * Add filter capacitors to LED, reset, and tamper switch connectors to reduce radiated emissions. |
| | 402 | === Revision D === |
| | 403 | Date: 09/11 |
| | 404 | * Increase default DDR2 memory size from 128Mytes to 256Mbytes due to price reduction in newer parts |
| | 405 | * Replace core voltage switchers with newer devices that do not require the reset generator for under voltage lockout |
| | 406 | * Update primary 3.3V switcher with newer Mosfets and Inductor to improve efficiency by 10% and improve transient response for supporting higher power radios. |
| | 407 | === Revision E === |
| | 408 | Date: 08/12 |
| | 409 | * Change the Mini-PCIe bridge reset from system reset to ARM Processor GPIOA11 to ensure it remains low until after the PCIe clock is valid. |
| | 410 | === Revision F === |
| | 411 | Date: 12/12 |
| | 412 | * Terminate unused PCIe bridge inputs to correct for TI design flaw that potentially locks up the bridge at low temperature and high humidity environments |
| | 413 | * Replace bipolar transistor used to drive fan with a MOSFET device for increased current capability |
| | 414 | * Add passive filter to JTAG system reset input to reduce EMI sensitivity. |
| | 415 | === Revision G === |
| | 416 | Date: 12/13 |
| | 417 | * Replace ARM processor clock with an external clock generator to reduce jitter on PCIe differential clocks |
| | 418 | * Add diodes to the PoE return paths on both channels for full isolation when being powered by an 802.3 switch |
| | 419 | * Replace N-channel MOSFET used to drive fan with a P-channel device for proper control. |
| | 420 | === Revision H === |
| | 421 | Date: 02/14 |
| | 422 | * Move the PCIe interrupts from processor digital I/O signals to dedicated interrupts for improved interrupt capability |
