GP2021
CONTENTS
Page
Page
TYPICAL GPS RECEIVER
3
4
7
7
CONTROLLING THE GP2021
24
PIN DESCRIPTION
DETAILED DESCRIPTION OF REGISTERS 28
FUNCTIONAL DESCRIPTION
12-Channel Correlator
Tracking Modules
PERIPHERAL FUNCTIONS
Dual UART
GP2021 Register Map
Correlator Registers
Tracking Channel Registers
Peripheral Functions Registers
Real Time Clock and Watchdog
DUART
28
30
30
43
43
43
44
45
47
51
8
11
11
12
12
14
15
15
21
Real Time Clock (RTC) and Watchdog
Power and Reset Control
Discrete l/O
SYSTEM CONTROL
GENERAL CONTROL
ELECTRICAL CHARACTERISTICS
TIMING CHARACTERISTICS
Digital System Test Interface
MICROPROCESSOR INTERFACE
SOFTWARE REQUIREMENTS
Absolute Maximum Ratings
60
41
These are not the operating conditions, but are the absolute
limits which if exceeded, even momentarily, may cause
permanent damage. To ensure sustained correct operation
the device should be used within the limits given under
Electrical Characteristics. It is essential for both VDD and
VSS to be present before input signals are applied.
61
40
GP2021
Supply voltage (VDD)
Input voltage (any input pin)
VSS20·3V to 16V
VSS20·3V to VDD10·3V
PIN 1 IDENT
Output voltage (any output pin) VSS20·3V to VDD10·3V
80
21
Storage temperature
255°C to 1150°C
GQ80
1
20
Figure 2 Pin connections - top view
Pin
Description
Pin
Description
Pin
Description
Pin
Description
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
MULTI_FN_IO
POWER _GOOD
NRESET_OP
NARMSYS
XIN
XOUT
TXA
TXB
RXA
NRD/NC
ARM_ALE/NC
DBE/NC
A6
A5
A4
A3
A2
D11
D12
D13
D14
D15
PLL_LOCK
VDD
DISCOP
VSS
CLK_T
CLK_I
VSS
ACCUM_INT
MEAS_INT
NBW/WRPROG
NMREQ/DISCIP2
NOPC/NINTELMOT
NRW/DISCIP3
MCLK/NC
ABORT MICRO_CLK
DISCIO
A22/READ
VDD
VSS
A21/NCS
A20/WREN
A9
A1/ALE_IP
A0/NRESET_IP
D0
D1
D2
D3
D4
D5
D6
VDD
VSS
D7
D8
D9
D10
RXB
NROM/NC
NEEPROM/NC
NSPARE_CS/NC
VDD
SAMPCLK
VDD
VSS
NBRAM / DISCIP4
SIGN0
MAG0
SIGN1
MAG1
DISCIP1
NRAM/NC
NW0/NC
NW1/NC
NW2/NC
NW3/NC
A8
A7
Table 1 Pin assignments
2
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
