User's Manual

AC4490 Specifications
AC4490 SpecificationsAC4490 Specifications
AC4490 Specifications
2/18/03
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11
3.
3.3.
3. Specifications
SpecificationsSpecifications
Specifications
3.1
3.13.1
3.1 I
II
I
NTERFACE
NTERFACE NTERFACE
NTERFACE
S
SS
S
IGNAL
IGNAL IGNAL
IGNAL
D
DD
D
EFINITIONS
EFINITIONSEFINITIONS
EFINITIONS
The AC4490 has a simple interface that allows OEM Host communications with the transceiver. Table 1
Table 1Table 1
Table 1
– Pin Definitions
– Pin Definitions– Pin Definitions
– Pin Definitions, shows the connector pin numbers and associated functions. The I/O direction is with
respect to the transceiver. All outputs are 3.3VDC levels and inputs are 5VDC TTL with the exception of
RSSI, AD In and AD Out, which are all analog. All inputs are weakly pulled High and may be left floating
during normal operation.
Table
Table Table
Table 1
11
1 –
– –
– Pin Definitions
Pin DefinitionsPin Definitions
Pin Definitions
Pin
PinPin
Pin Type
TypeType
Type Signal Name
Signal NameSignal Name
Signal Name Function
FunctionFunction
Function
1 O GO0 Interruptible Generic Output pin
2 O TXD Transmitted data out of the transceiver
3 I RXD Data input to the transceiver
4 I GI0 Interruptible Generic Input pin
5 GND GND Signal Ground
6 O Hop Frame Active Low when the transceiver is hopping.
7 O CTS Clear to Send – Active Low when the transceiver is ready to accept data for transmission.
8 I RTS Request to Send – When enabled in EEPROM, active Low when the OEM Host is ready to
accept data from the transceiver. NOTE: Keeping RTS High for too long can cause data loss.
9 O GO1 Generic Output pin
10 PWR VCC 3.3 or 3.3 – 6V ± 2%, ± 50mV ripple
11 PWR VCC 3.3 or 3.3 – 6V ± 2%, ±50 mV ripple
12 I 9600_BAUD 9600_BAUD – When pulled logic Low before applying power or resetting the transceiver’s
serial interface is forced to a 9600, 8, N, 1 rate. To exit, transceiver must be reset or power-
cycled with 9600_Baud logic High.
13 O RSSI Received Signal Strength - An analog output giving a relative indication of received signal
strength while in Receive Mode
14 I GI1 Generic Input pin
15 I UP_RESET RESET – Controlled by the AC4490 for power-on reset if left unconnected. After a Stable
power-on, a logic High pulse will reset the AC4490. Do not power-up the transceiver with this
pin tied Low.
16 GND GND Signal Ground
17 I Command/Data When logic Low, transceiver interprets Host data as command data. When logic High,
transceiver interprets Host data as transmit data.
18 I AD In Analog Data Input
19 O AD Out Analog Data Output
20 O IN_RANGE In Range – Active Low when a Client radio is in range of a Server on same Channel with the same
System ID.
I = Input to the transceiver O = Output from the transceiver