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1.0 Introduction
This application document describes the most significant differences between Navman Jupiter
31 GPS module and the Jupiter 21 GPS module.
This document is an aid for migrating from Jupiter 21 to Jupiter 31. While every effort has been
made to identify differences, it is incumbent on all customers to qualify the Jupiter 31 in each
application.
2.0 Technical description
Jupiter 21 and 21S are based on SiRF GSC2e LP GPS core architecture. Jupiter 31 is based
on SiRF GSC3 LP core architecture. J31 consists of a carrier board and a Jupiter 30 module
mounted with associated connectors and power circuitry for maximum backward compatibility
with Jupiter 21 series products.
3.0 Product applications
Jupiter 21:
TU21-D450-021
TU21-D450-031
TU21-D450-041
TU21-D550-021
TU21-D550-031
TU21-D550-041
Jupiter 31:
AA003041-G
AA003042-G
AA003043-G
4.0 Hardware comparison
Feature
SiRFStarIIe/LP
receiver.design
4.1 Primary power
Parameter
Input voltage
Current at full power (typical)
Current ( max)
Battery backup voltage
Battery backup current
Ripple
Low voltage detector system reset
*5VDC input requires addition of a regulator to existing board layout; ** battery backup voltage must not fall below
1.4.v
LA010812A © 2007 Navman Wireless. All rights reserved. Proprietary information and specifications subject to change without notice.
Jupiter 21
Jupiter 31
SiRFStarIII
chipset
GSC3e/LP chipset
Table 4-1: Hardware comparison
J21
3.1 to 5.5 VDC
75.mA
100.mA
2.5 to 5.5 VDC
10.µA
50.mV.pp
<.2.85.V
Table 4-2: Primary power comparison
Performance differences
1) J31 has faster TTFF
2) J31 has lower power
consumption
3) J31 has greater receiver
sensitivity
J21S
3.3 VDC
3.1 to 5.5 VDC
- 0.1/ + 0.3 VDC*
85.mA
<41.mA
110.mA
<.45.mA
2.5 to 5.5 VDC
1.9 to 3.6 VDC **
10.µA
5.to.6.µA
50.mV.pp
50.mV.pp
<.2.85.V
< 3.0 V
J31
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