SA58646 Datasheet, PDF (22/42 Pages) NXP Semiconductors – UHF 900 MHz transceiver IC

NXP Semiconductors
SA58646
UHF 900 MHz transceiver IC
SA58646_1
Product data sheet
Table 15. Data register 5 (address 101h) bit description …continued
Legend: * reset value.
Bit
Symbol
Value Description
3
BAT_DET
Battery detection
0
disable
1* enable
2 to 0 CLK_DIV[2:0]
Clock output divider. The Clockout signal is derived
from the crystal oscillator and is used to drive a
microcontroller (bit CLKO). The crystal signal is divided
down with a programmable divider value. To supply the
clock to the microcontroller and save current in the
handset, an external low power resonator may be used
and with the clock output disable
(bits CLK_DIV[2:0] = 000) as well as the crystal oscillator
not active (bit XTAL = 1). In Power-saving mode, the
divider ratio is programmed down to 128 to reduce the
microcontroller power consumption.
100* for values, see Table 17
Table 16. Carrier detection
Select CAR_DET_LEV[4:0]
Bit 4 Bit 3 Bit 2
0
0
0
0
1
0
0
0
2
0
0
0
3
0
0
0
4
0
0
1
5
0
0
1
6
0
0
1
7
0
0
1
8
0
1
0
9
0
1
0
10
0
1
0
11
0
1
0
12
0
1
1
13
0
1
1
14
0
1
1
15
0
1
1
16
1
0
0
17
1
0
0
18
1
0
0
19
1
0
0
20
1
0
1
21
1
0
1
22
1
0
1
23
1
0
1
Bit 1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
Bit 0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
RSSI threshold detection voltage (V)
0.1
0.14
0.18
0.22
0.26
0.3
0.34
0.38
0.42
0.46
0.5
0.54
0.58
0.62
0.66
0.7
0.74
0.78
0.82
0.86
0.9
0.94
0.98
1.02
Rev. 01 — 8 February 2007
© NXP B.V. 2007. All rights reserved.
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