Uart; Ring Indicator; Table 41. Usb Characteristics; Table 42. Uart Pads - Sierra Wireless AirPrime AR7558 Hardware Integration Manual

Hardware Integration Guide
Table 41. USB Characteristics
USB
Voltage range
USB_VBUS Maximum Current draw
Maximum Input Capacitance (Min ESR = 50 mΩ)
1 With the AirPrime AR7558 device powered ON.
6.5.

UART

The AirPrime AR7558 has two UART interfaces. The primary UART is an 8-wire
and the secondary UART is a 2-wire electrical interface.
Table 42. UART Pads
Pad Name
AD9 RXD1
AE6 RTS1
AD8 TXD1
AE7 CTS1
AF6 DCD1
AE5 DTR1
AF5 DSR1
DB2 RXD2
DA2 TXD2
1 If UART1 is implemented as a 2-wire interface, RTS1 should be pulled low to disable flow control.
6.6.

Ring Indicator

The Ring Indicator (RI) may be used to notify an external application of several events such as an
incoming call, timer expiration or incoming SMS.
Table 43. Ring Indicator Pad
Pad Name
AD7 RI1
The events which toggle the RI signal can be configured using the AT+WWAKESET command. The
duration of the RI pulse can be configured using the AT+WRID command.
The reason for the RI signal being activated can be queried using the AT+WWAKE command. Refer
to document [7] for details of these AT Commands.
The RI signal is independent of the UART.
1
Includes Ring Indicator which may also be used independently of UART1.
4116922
1
Direction Function
Output Receive Data (UART1)
Input Ready To Send (UART1)
Input Transmit Data (UART1)
Output Clear To Send (UART1)
Output Data Carrier Detect (UART1)
Input Data Terminal Ready (UART1)
Output Data Set Ready (UART1)
Output UART2 Receive Data
Input UART2 Transmit Data
Direction
Output
Rev 1.1
Function
Ring Indicator
Baseband Specification
Value Units
2.0 – 5.25
V
1 mA
μF
10
1
electrical interface
Interface If Unused
UART1 Leave Open
UART1 Leave Open1
UART1 Leave Open
UART1 Leave Open
UART1 Leave Open
UART1 Leave Open
UART1 Leave Open
UART2 Leave Open
UART2 Leave Open
If Unused
Leave Open
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