^ Name: | GECKOxsimple || ^ Maintainer | andreas.habeggerbfh.ch || ^ Revision: | 10.03.2011 || ^ Development status: | stable || ^ Compatibility: | GECKO3 / GECKO4 || ====== GECKOxsimple ====== The GECKOxsimple platform is a small, GECKO size power board. It contains a DC/DC converter to produce the 3.3V and a RS232 UART connection. The UART includes a level converter. ===== Power supply ===== The supply is based on the PT78ST133 from Texas Insturments. This 1.5 Amp Step-Down regulator can handle voltages from 9V to 26V. Datasheet: [[http://www.ti.com/lit/gpn/pt78st133|PT78ST133]] ===== RS232 UART ===== The UART has a MAX3232CSE ([[http://datasheets.maxim-ic.com/en/ds/MAX3222-MAX3241.pdf|Datasheet]]) level converter. The Tx and Rx lines are visualized over 2 LED. They flash up while transmitting data. The CTS and RTS lines are also implemented. All connections to the GECKOxmain are on GPIO1. ^Pin ^ Name ^ Direction ^GECKO3 ^GECKO4 ^ |GPIO1_40 | Tx | IN | K23 | M24 | |GPIO1_41 | Rx | OUT | K25 | M21 | |GPIO1_44 | RTS | IN | J23 | K24 | |GPIO1_45 | CTS | OUT | J22 | L21 | ===== UCF ===== To connect the GECKOxsimple with a uartlite-IP, only the Rx and Tx ports are needed. The UCF Lines for **GECKO3** could look similar to this: ''\\ NET "xps_uartlite_0_RX_pin" LOC = "K23" | IOSTANDARD = LVCMOS33; # GPIO1_40 TxD0 RS232 on GECKO4simple \\ NET "xps_uartlite_0_TX_pin" LOC = "K25" | IOSTANDARD = LVCMOS33; # GPIO1_41 TxD0 RS232 on GECKO4simple \\ '' You may changes the names of the ports corresponding to your system. The UCF Lines for **GECKO4** could look similar to this: ''\\ NET "xps_uartlite_0_RX_pin" LOC = "M24" | IOSTANDARD = LVCMOS33; # GPIO1_40 TxD0 RS232 on GECKO4simple \\ NET "xps_uartlite_0_TX_pin" LOC = "M21" | IOSTANDARD = LVCMOS33; # GPIO1_41 TxD0 RS232 on GECKO4simple \\ '' ===== Schematic ===== {{:gecko-platforms:geckoxsimple:power_docking.pdf|}}