参数资料
型号: MC68HC05SB7
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封装: MO-150, SSOP-28
文件页数: 23/170页
文件大小: 2161K
代理商: MC68HC05SB7
August 27, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05SB7
ANALOG SUBSYSTEM
MOTOROLA
REV 2.1
15-21
NOTE
Sufcient time should be allowed to discharge the external capacitor or
subsequent charge times will be shortened with resultant errors in timing
conversion.
NOTE
If the unknown voltage applied to the comparator is greater than its common-
mode range (VDD–1.5 volts) the external capacitor will try to charge to the same
level. This will cause both comparator inputs to be above the common-mode
range and the output will be indeterminate. All A/D conversion software methods
should have a maximum time check to determine if this case is occurring.
Table 15-5 gives examples of voltage ranges, resolution, ramp times and capaci-
tor sizes for various conversion methods.
Table 15-4. A/D Conversion Signals and Denitions
Name
Function
Conditions
ICHG
Charging current on external ramping capacitor
ICHG = 80 - 120 A
IDIS
Discharge current on external ramping capacitor
IDIS > 1 mA
VCAP
Voltage on external ramping capacitor
VSS < VCAP < (VDD – 1.5)
VX
Voltage of unknown on (–) input of voltage comparator
VSS < VX < (VDD –1.5)
VMAX
Maximum voltage on external ramping capacitor
VMAX = VDD – 1.0
tCHG
TIme to charge external capacitor
t from V
SS to VX
tDIS
Time to discharge external capacitor
t from V
MAX to VSS
C
Capacitance of external ramping capacitor
0.001 to 1.000
F
N
Number of counts for ICHG to charge C to VX
0 to 65536
P
Prescaler into timing function
fOSC ÷ loop time for software timing
fOSC ÷ 8 for Core Timer
fOSC ÷ 8 for Programmable TImer
fOSC
Clock source frequency (excluding any prescaling)
0 to 4.2 MHz
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