Amp’ed RF, Inc.
(phone) 408 213-9530
(fax) 408 213-9533
Hardware Design
Amp’ed RF modules support UART, SPI, and GPIO hardware interfaces. This section details
typical usage models for these features. Please note that the usage of these interfaces is
dependant upon the firmware that is loaded into the module, and is beyond the scope of this
document.
Notes
RESET pin is internally pulled high.
BOOT0 in should be tied low to start from application code ROM, high will enable the boot
ROM code for Oki ISFP chip programming.
MODE2 is internally pulled high, to use the internal clock source by default.
MODE3 is internally pulled low. This pin is reserved for testing.
All GND pins must be well grounded.
The area around the module should be free of any ground planes, power planes, trace routings,
or metal for at least 8 mm from the antenna in all directions.
Traces should not be routed underneath the module.
Module Reflow Installation
The ZB-21 is a surface mount module supplied on a 24 pin, 4-layer PCB. The final assembly
recommended reflow profile is:
For RoHS/Pb-free applications, Sn96.5/Ag3.0/Cu0.5 solder is recommended.
Maximum peak temperature of 230° - 240°C (below 250°C).
Maximum rise and fall slope after liquidous of < 2°C/second.
Maximum rise and fall slope after liquidous of < 3°C/second.
Maximum time at liquidous of 40 – 80 seconds.
GPIO Interface
All GPIOs are capable of sinking and sourcing 3mA of I/O current, except GPIO5,6,and 7,
which can sink 20mA of current. These pins are 5V tolerant.
UART Interface
The UART is compatible with the 16550 industry standard. Four
signals are provided with the UART interface. The TXD and RXD
pins are used for data while the CTS and RTS pins are used for
ow control.
fl
PCB Layout Guidelines
©2008 Amp’ed RF Inc
1722 Ringwood Ave, Suite 250, San Jose, CA 95131, USA
KC21 Datasheet 03/3/2008
www.ampedrf.com
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