SA58646 datasheet(8/42 Pages) NXP

Part #	SA58646

Description	UHF 900 MHz transceiver IC

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Manufacturer	NXP [NXP Semiconductors]

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SA58646_1

Product data sheet

Rev. 01 — 8 February 2007

8 of 42

NXP Semiconductors

SA58646

UHF 900 MHz transceiver IC

[1]

In RX and TX mode, the crystal oscillator is automatically activated. An external frequency can be forced to

pins XTALI and XTALO.

[2]

In RX and TX mode, the voltage regulator with adjustment is automatically enabled; bit REG can be either

logic 1 or logic 0.

[3]

If the voltage doubler is enabled, the crystal oscillator is automatically activated.

[4]

In Inactive mode, the earpiece ampliﬁer is automatically disabled.

7.1.3 Control bits in power saving modes

Table 5 shows the control bit values for selection of each mode and the typical current

consumption for those modes.

When the clock output is activated, an extra power consumption is applied which is

proportional to the programmed bit CLKO. If bit XTAL_H = 0, then the crystal loss is less

than 50

Ω to ensure reliable start-up.

Table 4.

Activated blocks

Circuit block

Mode

Active

RX

Inactive

Crystal active[1]

XXX

Clock output not disabled

X

Voltage regulator active[2]

XXX

Power ampliﬁer active

X

-

Doubler enabled[3]

XXX

Hard limiter or automatic level control not

disabled

X-

-

Earpiece ampliﬁer enabled

X

-[4]

Table 5.

Control bit values

VCC = 3.3 V; Tamb =25 °C; fxtal = 10.24 MHz.

Power saving

mode

MODE[1:0]

Conditions

Typical

current

consumption

Bit 1

Bit 0

Voltage

doubler

Crystal

oscillator

Voltage

regulator

Clock

output

Active mode

1

-

76 mA

RX mode

1

0

-

58 mA

Inactive mode

0

X

inactive

disabled

< 10

µA

XTAL_H = 0

210

µA

XTAL_H = 1

300

µA

inactive

XTAL_H = 1

enabled

disabled

550

µA

active

690

µA

Table 6.

Extra power consumption

Divider ratio

Extra current consumption

Bits CLK_DIV[2:0]

Bit CLKO = 0

Bit CLKO = 1

XXX (1, 2, 2.5, 4, 128)

520

µA

350

µA

000 (off)

0

µA0 µA

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