LTP5902-IPM_15 datasheet(21/32 Pages) LINER

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LTP5901-IPM/LTP5902-IPM

59012ipmf

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pin FuncTions

VSUPPLY: System and I/O Power Supply. Provides power

to the module. The digital-interface I/O voltages are also

set by this voltage.

ANTENNA: Multiplexed Receiver Input and Transmitter

Output Pin. The impedance presented to the MMCX con-

nectorshouldbe50Ω,single-endedwithrespecttoground.

AI_0, AI_1, AI_2, AI_3: Analog Inputs. These pins are

multiplexed to the analog input chain. The analog input

chain, as shown in Figure 8, is software-configurable

and includes a variable-gain amplifier, an offset-DAC for

adjusting input range, and a 10-bit ADC. Valid input range

is between 0V to 1.8V. Analog inputs can be sampled as

described in section Signal/Data Acquisition and Control.

TMS, TCK, TDI, TDO: JTAG Port Supporting Software

Debug and Boundary Scan.

SLEEPn: The SLEEPn function is not currently supported

in software. The SLEEPn input must either be tied, pulled

or actively driven high to avoid excess leakage.

UART_RX,UART_RX_RTSn,UART_RX_CTSn,UART_TX,

UART_TX_RTSn,UART_TX_CTSn:TheAPIUARTinterface

includes bidirectional wake up and flow control. Unused

inputsignalsmustbedrivenorpulledtotheirinactivestate.

TIMEn: Strobing the TIMEn input is the most accurate

method to acquire the network time maintained by Eterna.

Eterna latches the network time stamp with sub-micro-

second resolution on the rising edge of the TIMEn signal

and produces a packet on the API serial port containing

the timing information.

UARTC0_RX, UARTC0_TX: The CLI UART provides a

mechanism for monitoring, configuration and control of

Eterna during operation. For a complete description of

the supported commands see the SmartMesh IP Mote

CLI Guide.

GPIO3,GPIO4,GPIO5,GPIO6,GPIO20,GPIO21,GPIO22,

GPIO23,GPIO26:GeneralpurposeI/Osthatcanbesampled

or driven as described in the Signal/Data Acquisition and

Control section.

FLASH_P_ENn, IPCS_SSn, IPCS_SCK, IPCS_MISO,

IPCS_SSn: The In-Circuit Programming Control System

(IPCS)busenablesin-circuitprogrammingofEterna’sflash

memory. IPCS_SCK is a clock and should be terminated

appropriately for the driving source to prevent overshoot

and ringing.

Figure 8. Analog Input Chain

59012ipm F08

ANALOG INPUT

3-BIT

VGA

4-BIT DAC

10-BIT ADC

RESETn:Theasynchronousresetsignalisinternallypulled

up. Resetting Eterna will result in the ARM Cortex M3

rebooting and loss of network connectivity. Use of this

signal for resetting Eterna is not recommended, except

during power-on and in-circuit programming.

RADIO_INHIBIT: RADIO_INHIBIT provides a mechanism

foranexternaldevicetotemporarilydisable radiooperation.

Failure to observe the timing requirements defined in the

RADIO_INHIBIT AC Characteristics section, may result

in unreliable network operation. In designs where the

RADIO_INHIBIT function is not needed the input must

either be tied, pulled or actively driven low to avoid excess

leakage.

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