EZ80L925048MOD Datasheet, PDF (18/38 Pages) Zilog, Inc. – eZ80L92 Module is a compact, high-performance Ethernet module

eZ80L925048MOD
eZ80L92 Module Product Specification
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Onboard Component Description
Logic-Level I/Os
The I/O connector features 24 general-purpose 3.3 V CMOS I/O pins that can be
used as outputs or inputs interfacing to external logic. All I/Os are 5 V tolerant.
Some of the General-Purpose I/O pins support dual mode functions (SPI, Timer I/
O, UARTs and bit I/O with edge- or level-triggered interrupt functions on each pin).
For more information on eZ80L92 dual modes, please refer to the eZ80L92 Prod-
uct Specification (PS0130).
Onboard Battery Backup
An onboard 0.1 F capacitor (GoldCap) is used to bridge power outages of 2–4
hours if the power supply to the module is disconnected. The capacitor is charged
to 3.1 V during normal operation and is discharged through the on-chip Real Time
Clock. The V_RTC pin is available on the I/O connector of the module to connect
external components to a power supply or to a larger GoldCap.
Caution: Do not connect a Lithium Battery to the GoldCap capacitor, because
onboard charging circuitry for the capacitor can destroy the lithium bat-
tery.
Ethernet Media Access Controller
The eZ80L92 Module contains a CS8900A EMAC (MAC, PHI, and RAM) which is
attached to the data/address bus of the processor. This chip is connected to the
processor’s CS3 Chip Select, A0–A3, D0–D7, RD, WR, and PD4 pins for interrupt
purposes. Connection of pins PD6 and PD7 for LANACT (wake-up from sleep)
and SLEEP is optional and resistor-selectable onboard (see below).
Ethernet LEDs
There are two green LEDs, a Link LED and a LAN LED, that are located adjacent
to each other on the eZ80L92 Module. A flashing LAN LED (top) indicates
received link pulses from the 10 Base-T Ethernet. This LAN LED should be ON if
RX+ is connected to TX+ and RX– is connected to TX–. A steady Link LED (bot-
tom) indicates Traffic (RX or TX) on the LAN.
PS017005-0903
PRELIMINARY
Onboard Component Description