Topaz Interface Signals
This section details all of the signals that interface to the Topaz. For more details on i.MX25 signals, refer to the Freescale documentation.
The signals have been broken up into the logical groupings based on commonly used functions.
Signal Descriptions
The following table includes:
Pad/Pin number: Pad refers to the LGA pad, Pin refers to the pin number on the SO-DIMM connector.
Voltage: Topaz includes a mixture of 3.3V and 1.8V signals.
Name: This corresponds with the i.MX25 pin name where the signal originates from the i.MX25
GPIO: This column lists the i.MX25 GPIO number for signals that include this capability
Alternate function: This lists the most common alternate functions available on a given pad. Not all functions have been included. Refer to the Freescale documentation for a complete list
Description. Gives a brief description of the signal to include any information specific to the Topaz Module. For a detailed description, consult the Freescale i.MX25 documentation
Pad/Pin | Voltage | Name |
| GPIO | Alternate Functions | Description |
|---|---|---|---|---|---|---|
Power |
|
|
|
|
|
|
C3/140 | 3.3V | PSU_LION |
|
|
| Input into the MC3470 PMIC. Pull high to VIN to indicate the module is powered by a Li-Ion battery. |
D3/149 | 3.3V | ON/OFF |
|
|
| Hardware enable/disable for the Power Management IC. Refer to the MC37704 data sheet for details. |
E3/148 | Power | 3V3_REG5 |
|
|
| 3.3V Power rail. This rail can supply up to 500mA and must be enabled via software. |
C11/142 | Power | VG_NC |
|
|
| Not used - do not connect to this pad. |
D11/144 | Power | VLED |
|
|
| LED backlight power supply. Up to 30mA is available and is generally suitable for displays up to 3.5". For larger devices a dedicate LED supply will be required. |
E11/145 | Power | VLED_FB |
|
|
| Feedback signal for LED backlight power supply. |
F11/3&4 | Power | VIN |
|
|
| Module power supply input. |
H8/146 | Power | 1V8 |
|
|
| 1.8V power rail. |
H9/143 | Power | QVDD_NC |
|
|
| In non-security applications, connect this to DRYICE_VBAT. |
B12/147 | Power | 3V3_REG2 |
|
|
| 3.3V power rail. Use this to power devices at boot time including pull-up resistors used for boot configuration, JTAG and debug serial ports. Up to 100mA is available. All other 3.3V power should be taken from 3V3_REG5. |
V2/159 | 3.3V | POWER_FAIL |
| 3-19 | AUD7_RXD |
|
M1/141 | Power | 1V5_LDO_NC |
|
|
| Do not connect to this pad. Used for test only. |
A1, Y1, A19, Y19 |
|
| Ground (0V) pads on the Surface-mount version. |
|
|
|
1, 2, 23, 24, 55, 56, 67, 68, 81, 82, 99, 100, 121, 122, 135, 136, 157, 158, 199, 200 |
|
| Ground (0V) pins on the SO-DIMM version. |
|
|
|
USB |
|
|
|
|
|
|
Y3/75 | Analog | USBPHY2_D+ |
|
|
| USB Host Data +. Full Speed only. |
Y4/77 | Analog | USBPHY2_D- |
|
|
| USB Host Data -. Full Speed only. |
Y10/71 | Analog | USBPHY1_D+ |
|
|
| USB OTG Data + High speed capable. |
Y11/73 | Analog | USBPHY1_D- |
|
|
| USB OTG Data - High speed capable. |
Y12/79 | 3.3V | USBPHY1 _VBUS |
|
|
| USB OTG |
Y13/69 | 3.3V | USBPHY1_UID |
|
|
| USB OTG ID |
Ethernet |
|
|
|
|
|
|
C18/123 | Analog | TX+ |
|
|
| 10/100 Ethernet interface signals. Connect to magnetics. |
C19/125 | Analog | TX- |
|
|
|
|
D18/129 | Analog | RX- |
|
|
|
|
D19/127 | Analog | RX+ |
|
|
|
|
E18/124 | 3.3V | LED0 |
|
|
| LED Mode = [00]: Link/Activity |
E19/126 | 3.3V | LED1 |
|
|
| LED Mode = [00]: Speed(High=10BT, Low = 100BT) |
UART 1 and 2 |
|
|
|
|
|
|
C1/8 | 3.3V | UART1_RXD |
| 4-22 | UART2_DTR | UART1 Receive data signal |
C2/9 | 3.3V | UART1_TXD |
| 4-23 | UART2_DSR | UART1 Transmit data signal |
D2/10 | 3.3V | UART1_RTS |
| 4-24 | CSI_D0 | UART1 Ready-to-send hardware handshake signal. Note that this is an INPUT and if connecting to a PC should be connected to the signal labeled RTS. |
D1/11 | 3.3V | UART1_CTS |
| 4-25 | CSI_D1 | UART1 Clear-to-send hardware handshake signal. Note that this is an OUTPUT and if connecting to a PC should be connected to the signal labeled CTS. |
F4/12 | 3.3V | UART2_TXD |
| 4-27 | ESDHC1_DAT6 | UART2 Transmit data signal |
G4/13 | 3.3V | UART2_RXD |
| 4-26 | ESDHC1_DAT7 | UART2 Receive data signal |
J4/14 | 3.3V | UART2_RTS |
| 4-28 | ESDHC1_DAT5 | UART2 Ready-to-send hardware handshake signal. Note that this is an INPUT and if connecting to a PC should be connected to the signal labeled RTS. |
H4/15 | 3.3V | UART2_CTS |
| 4-29 | ESDHC1_DAT4 | UART2 Clear-to-send hardware handshake signal. Note that this is an OUTPUT and if connecting to a PC should be connected to the signal labeled CTS. |
SD Card |
|
|
|
|
|
|
T14/97 | 3.3V | eSDHC1_CLK |
| 2-24 | CSPI2_MISO | SD Card Clock |
U14/98 | 3.3V | eSDHC1_CMD |
| 2-23 | CSPI2_MOSI | SD Card CMD signal. |