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SA58646 Datasheet(PDF) 8 Page - NXP Semiconductors |
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SA58646 Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 42 page SA58646_1 © NXP B.V. 2007. All rights reserved. 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 X 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 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 1 - - - - 76 mA RX mode 1 0 - - - - 58 mA Inactive mode 0 X inactive disabled disabled 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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