參數(shù)資料
型號： MC68HC05SB7
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO28
封裝： MO-150, SSOP-28
文件頁數(shù)： 164/170頁
文件大?。?/td> 2161K
代理商： MC68HC05SB7
August 27, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05SB7
CURRENT SENSE AMPLIFIER
MOTOROLA
REV 2.1
13-1
SECTION 13
CURRENT SENSE AMPLIFIER
The Current Sense Amplier module, used in conjunction with the Analog Sub-
system, is designed to monitor charge and discharge currents in smart battery
applications.
13.1
CURRENT SENSE AMPLIFIER APPLICATION
A typical connection for the Current Sense Amplier (CSA) block is illustrated in
Figure 13-1. With a sense resistor, RSENSE of 0.01, the voltage setup across the
node CSA and VSS (ground) will vary to the current (in either charging or discharg-
ing mode) as shown in Table 13-1.
In this case, the CSA is required to measure a current from 10mA to 5A over the
operating temperature from 0
°C to 70°C.
With the A/D in the Analog Subsystem set up for 12-bit resolution, the step size is
approximately 1.22mV (VDD=5V). To measure the 0.1mV for the 10mA current
ow, a gain of greater than 10 is required.
The CSA module is designed with two gain settings, 10 and 30. With a 10-bit A/D,
and a gain of 30, the CSA can measure current with a typical resolution of 17mA
steps.
After amplication, the resultant signal is fed to channel 6 (MUX6) of the analog
subsystem for A/D conversion.
Table 13-1. Voltage Across the Sense Resistor against Current
Current flowing
Voltage across the Sense Resistor, RSENSE
10mA
0.1mV
1A
10mV
5A
50mV
RSENSE=0.01
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