MPC5601DXLL datasheet(38/77 Pages) FREESCALE

38 / 77 page

MPC5602D Microcontroller Data Sheet, Rev. 3.1

Preliminary—Subject to Change Without Notice

Electrical characteristics

Freescale Semiconductor

4.9.2

Voltage monitor electrical characteristics

The device implements a power-on reset (POR) module to ensure correct power-up initialization, as well as four low voltage

detectors (LVDs) to monitor the VDD and the VDD_LV voltage while device is supplied:

•

POR monitors VDD during the power-up phase to ensure device is maintained in a safe reset state

•

LVDHV3 monitors VDD to ensure device reset below minimum functional supply

•

LVDHV5 monitors VDD when application uses device in the 5.0 V ± 10% range

•

LVDLVCOR monitors power domain No. 1

•

LVDLVBKP monitors power domain No. 0

NOTE

When enabled, power domain No. 2 is monitored through LVD_DIGBKP.

Figure 8. Low voltage monitor vs. reset

3 This capacitance value is driven by the constraints of the external voltage regulator supplying the V

DD_BV voltage.

A typical value is in the range of 470 nF.

4 This value is acceptable to guarantee operation from 4.5 V to 5.5 V.

5 External regulator and capacitance circuitry must be capable of providing I

DD_BV while maintaining supply VDD_BV

in operating range.

6 In-rush current is seen only for short time during power-up and on standby exit (max 20 µs, depending on external

capacitances to be load).

VDD

VLVDHVxH

RESET

VLVDHVxL

MPC5601DXLL 数据表(PDF) 38 Page - Freescale Semiconductor, Inc