- AD VA NCE D IN F O RMA T IO N -

6

Dust Networks

LTP5903-WHR Datasheet

3.3

3.3 V Output Supply

The LTP5903-WHR includes a regulated 3.3 V output signal (labeled +3V3) for supplying power to user circuitry (for

example, isolation or signal conditioning). Note that any power drawn on +3V3 circuitry results in an increase in power

drawn on +5V_IN.

Table 10 +3.3 V Power Supply Output

Parameter

Min

Typ

Max

Units

Comments

+3V3 current source

100

mA

+3V3 supply voltage

3.13

3.46

V

3.4

Device Load

Table 11 Device Load

Parameter

Min

Typ

Max

Units

Comments

Total capacitance

290

µF

Total inductance

8

µH

3.5

AC Timing Specifications

Table 12 AC Timing Specifications

Parameter

Min

Typ

Max

Units

Comments

nRESET_IN pulse width

125

µs

4.0

Real-time Clock

The LTP5903-WHR has a battery-backed real-time clock (RTC) with a typical lifetime of 5-7 years (lifetime up to 15 years if

the manager is normally powered), assuming the manager is operating at 60 °C average ambient temperature and at 10% duty

cycle. Upon bootup, the RTC initializes the software system clock that handles timekeeping while the system is operating.

The software system clock is the reference for UTC time values readable through the software APIs, command line interface

(CLI) and Admin Toolset Web interface, as well as the UTC time values visible in manager log files. The system clock may

be set manually using the Admin Toolset Web interface, or through the Linux command shell. The accuracy of the software

system clock is typically 1 min/month at 25°C, though may vary as much as 10 min/month at temperature extremes. To

support applications less tolerant of such drift, the LTP5903-WHR software includes an NTP client to periodically

synchronize software system time to an outside source. The NTP client is configurable using the Admin Toolset Web

interface, or through the Linux command shell.

5.0

Radio

5.1

Detailed Radio Specifications

Table 13 Radio Specifications

Parameter

Min

Typ

Max

Units

Comments

Operating frequency

2.4000

2.4835

GHz

Number of channels

15

Channel separation

5

MHz

Occupied channel bandwidth

2.7

MHz

At –20 dBc

Frequency accuracy

-40

+40

ppm

Modulation

IEEE 802.15.4 DSSS

Raw data rate

250

Kbps

Receiver operating input level

0

dBm

Receiver sensitivity

–92.5

dBm

25 °C

–90

dBm

25 °C, (inferred by 50% PER