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MC33596 Datasheet(PDF) 6 Page - Freescale Semiconductor, Inc

Part No. MC33596
Description  PLL Tuned UHF Receiver for Data Transfer Applications
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MC33596 Datasheet(HTML) 6 Page - Freescale Semiconductor, Inc

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MC33596 Data Sheet, Rev. 4
Power Supply
Freescale Semiconductor
6
5Power Supply
The circuit can be supplied from a 3 V voltage regulator or battery cell by connecting VCCIN,
VCCINOUT, and VCCDIG (See Figure 43 or Figure 44). It is also possible to use a 5 V power supply
connected to VCCIN; in this case VCCINOUT and VCCDIG should not be connected to VCCIN (See
Figure 45 or Figure 46).
An on-chip low drop-out voltage regulator supplies the RF and analog modules (except the strobe
oscillator and the low voltage detector, which are directly supplied from VCCINOUT). This voltage
regulator is supplied from pin VCCINOUT and its output is connected to VCC2OUT. An external
capacitor (C8 = 100 nF) must be inserted between VCC2OUT and GND for stabilization and decoupling.
The analog and RF modules must be supplied by VCC2 by externally wiring VCC2OUT to VCC2IN,
VCC2RF, and VCC2VCO.
A second voltage regulator supplies the digital part. This regulator is powered from pin VCCDIG and its
output is connected to VCCDIG2. An external capacitor (C10 = 100 nF) must be inserted between
VCCDIG2 and GNDDIG, for decoupling. The supply voltage VCCDIG2 is equal to 1.6 V. In standby
mode, this voltage regulator goes into an ultra-low-power mode, but VCCDIG2 = 0.7
× VCCDIG.
This enables the internal registers to be supplied, allowing configuration data to be saved.
6
Supply Voltage Monitoring and Reset
At power-on, an internal reset signal (Power-on Reset, POR) is generated when supply voltage is around
1.3 V. All registers are reset.
When the LVDE bit is set, the low-voltage detection module is enabled. This block compares the supply
voltage on VCCINOUT with a reference level of about 1.8 V. If the voltage on VCCINOUT drops below
1.8 V, status bit LVDS is set. The information in status bit LVDS is latched and reset after a read access.
NOTE
If LVDE = 1, the LVD module remains enabled. The circuit cannot be put
in standby mode, but remains in LVD mode with a higher quiescent current,
due to the monitoring circuitry. LVD function is not accurate in standby
mode.
Table 3. Supply Voltage Range Versus Ambient Temperature
Parameter
Symbol
Temperature Range1
NOTES:
1
–40°C to +85°C: MC33596FCE/FJE.
–20°C to +85°C: MC33596FCAE/FJAE.
Unit
–40°C to +85°C
–20°C to +85°C
Supply voltage on VCCIN, VCCINOUT, VCCDIG for 3 V operation
VCC3V
2.7 to 3.6
2.1 to 3.6
V
Supply voltage on VCCIN for 5 V operation
VCC5V
4.5 to 5.5
4.5 to 5.5
V


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