Datasheet

56F8037/56F8027 Data Sheet, Rev. 8
146 Freescale Semiconductor
10.2.1 Voltage Regulator Specifications
The 56F8037/56F8027 has two on-chip regulators. One supplies the PLL and relaxation oscillator. It has
no external pins and therefore has no external characteristics which must be guaranteed (other than proper
operation of the device). The second regulator supplies approximately 2.5V to the 56F8037/56F8027’s
core logic. This regulator requires an external 4.4F, or greater, capacitor for proper operation. Ceramic
and tantalum capacitors tend to provide better performance tolerances. The output voltage can be
STANDBY > STOP 100kHz Device Clock
Relaxation Oscillator in Standby mode
PLL powered off
Processor Core in STOP state
All peripheral module and core clocks are off
ADC/DAC/Comparator powered off
Voltage regulator in Standby mode
540A0A 650A1A
POWERDOWN Device Clock is off
Relaxation Oscillator powered off
PLL powered off
Processor Core in STOP state
All peripheral module and core clocks are off
ADC /DAC/Comparator powered off
Voltage Regulator in Standby mode
440A0A 550A1A
1. No Output Switching
All ports configured as inputs
All inputs Low
No DC Loads
Table 10-7 Power-On Reset Low-Voltage Parameters
Characteristic Symbol
Min
Typ Max Unit
Low-Voltage Interrupt for 3.3V supply
1
1. When V
DD
drops below V
EI3.3
, an interrupt is generated.
V
EI3.3
2.58 2.7 — V
Low-Voltage Interrupt for 2.5V supply
2
2. When V
DD
drops below V
EI32.5
, an interrupt is generated.
V
E12.5
—2.15— V
Low-Voltage Interrupt Recovery Hysteresis V
EIH
—50—mV
Power-On Reset
3
3. Power-On Reset occurs whenever the internally regulated 2.5V digital supply drops below 1.8V. While
power is ramping up, this signal remains active for as long as the internal 2.5V is below 2.15V or the 3.3V
1/O voltage is below 2.7V, no matter how long the ramp-up rate is. The internally regulated voltage is
typically 100mV less than V
DD
during ramp-up until 2.5V is reached, at which time it self-regulates.
POR — 1.8 1.9 V
Table 10-6 Current Consumption per Power Supply Pin (Continued)
Mode Conditions
Typical @ 3.3V, 25°C Maximum@ 3.6V, 25°C
I
DD
1
I
DDA
I
DD
1
I
DDA