Motorola ColdFire MCF5281 User Manual
Page 693
Electrical Characteristics
Freescale Semiconductor
33-9
Table 33-10. QADC Electrical Specifications (Operating)
1
(V
DDH
and V
DDA
= 5.0 V
dc
±
0.5V, V
DD
= 2.7-3.6V, V
SS
and V
SSA
= 0 V
dc
, FQCLK = 2.0 MHz, TA within operating temperature
range)
1
QADC converter specifications are only guaranteed for VDDH and VDDA = 5.0V +/- 0.5V. VDDH and VDDA may be
powered down to 2.7V with only GPIO functions supported.
Parameter
Symbol
Min
Max
Unit
Analog Supply — MCF521x
Analog Supply — MCF528x
V
DDA
4.5
3.3
5.5
5.5
V
V
SS
Differential Voltage
V
SS
– V
SSA
-100
100
mV
Reference Voltage Low
2
2
To obtain full-scale, full-range results, V
SSA
≤ V
RL
≤ V
INDC
≤ V
RH
≤ V
DDA
V
RL
V
SSA
V
SSA
+ 0.1
V
Reference Voltage High
2
V
RH
V
DDA
– 0.1
V
DDA
V
V
REF
Differential Voltage
— MCF521x
V
REF
Differential Voltage
— MCF528x
V
RH
– V
RL
4.5
3.3
5.5
5.5
V
Input Voltage
V
INDC
V
SSA
–0.3
V
DDA
+ 0.3
V
Input High Voltage, PQA and PQB
V
IH
0.7 (V
DDA
)
V
DDA
+ 0.3
V
Input Low Voltage, PQA and PQB
V
IL
V
SSA
– 0.3
0.4(V
DDA
)
V
Input Hysteresis, PQA, PQB
3
3
Parameter applies to the following pins:
Port A: PQA[4:3]/AN[56:55]/ETRIG[2:1], PQA[1:0]/AN[53:52]/MA[1:0]
Port B: PQB[3:0]/AN[3:0]/AN[Z:W]
V
HYS
0.5
—
V
Output High Voltage, PQA/PQB
3
I
OH
= TBD
V
OH
VDDH-0.8
—
—
V
Analog Supply Current
Normal Operation
4
Low-Power Stop
4
Current measured at maximum system clock frequency with QADC active.
I
DDA
—
—
5.0
10.0
mA
μA
Reference Supply Current, DC
Reference Supply Current, Transient
I
REF
I
REF
—
—
250
2.0
µA
mA
Load Capacitance, PQA/PQB
C
L
—
50
pF
Input Current, Channel Off
5
5
Maximum leakage occurs at maximum operating temperature. Current decreases by approximately one-half for each 8
to 12° C, in the ambient temperature range of 50 to 125 °C.
I
OFF
-200
200
nA
Total Input Capacitance
6
PQA Not Sampling
PQB Not Sampling
Incremental Capacitance added during sampling
6
This parameter is characterized before qualification rather than 100% tested.
C
IN
—
—
—
15
10
5
pF
MCF5282 and MCF5216 ColdFire Microcontroller User’s Manual, Rev. 3