Freescale Semiconductor Eval, Demo and Development Board for MCF51MM256 TWR-MCF51MM TWR-MCF51MM Ficha De Dados

Freescale Semiconductor

22

20

V

LVWH

Low-voltage 
warning 
threshold —
high range

9

V

DD

 falling

—

2.36

2.46

2.56

V

P

V

DD

 rising

—

2.36

2.46

2.56

V

P

21

V

LVWL

Low-voltage 
warning 
threshold —
low range

9

V

DD

 falling

—

2.11

2.16

2.22

V

P

V

DD

 rising

—

2.16

2.21

2.27

V

P

22

V

hys

Low-voltage inhibit 
reset/recoverhysteresis

10

 

—

—

50

—

mV

C

23

V

BG

Bandgap Voltage Reference

11 

—

1.110

1.17

1.230

V

P

1

Typical values are measured at 25

C. Characterized, not tested

2

As the supply voltage rises, the LVD circuit will hold the MCU in reset until the supply has risen above V

LVDL

.

3

Does not include analog module pins. Dedicated analog pins should not be pulled to V

DD

 or V

SS

 and should be left floating when not 

used to reduce current leakage. 

4

Measured with V

In 

= V

DD

.

5

All functional non-supply pins are internally clamped to V

SS

 and V

DD 

except PTD1.

6

Input must be current limited to the value specified. To determine the value of the required current-limiting resistor, calculate 
resistance values for positive and negative clamp voltages, then use the larger of the two values.

7

Power supply must maintain regulation within operating V

DD 

range during instantaneous and operating maximum current conditions. 

If positive injection current (V

In

 > V

DD

) is greater than I

DD

, the injection current may flow out of V

DD

 and could result in external power 

supply going out of regulation. Ensure external V

DD

 load will shunt current greater than maximum injection current. This will be the 

greatest risk when the MCU is not consuming power. Examples are: if no system clock is present, or if clock rate is very low (which 
would reduce overall power consumption).

8

Maximum is highest voltage that POR is guaranteed.

9

Run at 1 MHz bus frequency

10

Low voltage detection and warning limits measured at 1 MHz bus frequency.

11

Factory trimmed at V

DD

 = 3.0 V, Temp = 25

C