AC4490 Hardware Integration Guide
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H
ARDWARE
Pin Definitions
The AC4490 has a simple interface that allows OEM host communications with the transceiver and shows the
connector pin numbers and associated functions.
Table 4: AC4490 Pin Definitions
Module
Pin
1x1
Pin
Type Signal Name
Function
1
4
O
GO0
Generic Output pin
2
6
O
TXD
Serial data output from the module to the OEM Host.
3
7
I
RXD
Serial data input to the module from the OEM Host.
4
5
1
GI0
Generic Input pin
5
3
GND GND
Signal Ground
6
O
Hop Frame Pulses low when the transceiver is hopping frequencies.
7
9
O
CTS
Clear to Send – Active Low when the transceiver is ready to accept
data for transmission. CTS should be monitored by the OEM Host
& data flow to the radio should cease when CTS is High.
8
10
1
I
RTS
Request to Send – When enabled in EEPROM, the OEM Host can
take this High when it is not ready to accept data from the
transceiver.
Note: Keeping RTS High for too long can cause data loss.
9
19
O
GO1
Generic Output pin
10
2
PWR VCC
Powers the radio and microcontroller. Must be connected.
1x1:
3.3 V, +/- 50 mV ripple
200:
3.3 – 5.5 V, +/- 50 mV ripple (Pin 10 is internally
connected to Pin 11)
1000:
3.3 – 5.5V, +/-50mV ripple
11
11
PWR VPA
Powers the power-amplifier and draws most current when in TX
mode. Must be connected.
1x1:
3.3 V, +/- 50 mV ripple
200:
3.3 – 5.5 V, +/- 50 mV ripple (Pin 11 is internally
connected to Pin 10)
1000:
3.3 V +/- 3%, +/- 100 mV ripple
12
23
I
Test
Test Mode – When pulled logic Low and then applying power or
resetting, the transceiver’s serial interface is forced to a 9600, 8-N-
1 rate. To exit, the transceiver must be reset or power-cycled with
Test Mode logic High.
13
12
O
RSSI
Received Signal Strength - An analog output giving an
instantaneous indication of received signal strength. Only valid
while in Receive Mode.
14
21
1
I
GI1
Generic Input pin
15
16
I
UP_RESET
RESET – Controlled by the AC4490 for power-on reset if left
unconnected. After a stable power-on reset, a logic High pulse will
reset the transceiver.
16
13
GND GND
Signal Ground
