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: 165/170页
文件大小: 2161K
代理商: MC68HC05SB7
GENERAL RELEASE SPECIFICATION
August 27, 1998
MOTOROLA
CURRENT SENSE AMPLIFIER
MC68HC05SB7
13-2
REV 2.1
Figure 13-1. Current Sense Amplier Block
13.2
CURRENT SENSE INTERRUPT
The CSA can generate an interrupt once it detects a (discharge) current passes
through the current sensing resistor, RSENSE. The trip current depends on the
value of the sense resistor; it is voltage developed across RSENSE, VDET that trips
the interrupt. VDET is set typically at –15mV, with –10mV being the minimum.
13.3
CSA STATUS AND CONTROL REGISTER (CSSCR)
The CSA status and control register is shown in Figure 13-2.
Port B
0.01
Batt+
Batt–
I/O
Logic
CSEN
D
Q
Gain Adjustment
CDEN
VSS
+
PB2/
PB3/
CS0
CS1
VMID
(For internal test)
CSCAL
(bit 7 of $0A)
(bit 4 of $0A)
x10 (bit 5 of $0A)
x30 (bit 6 of $0A)
To analog
MUX 6 input
CSA
+
VDD
(bit 3 of $0A)
CDET
Interrupt
R
CDIE
CDIFR
(bit 2 of $0A)
CDEN
(bit 3 of $0A)
CSSEL
(bit 3 of $0B)
Logic
(bit 1 of $0A)
RSENSE
VDET
Typically –15mV
CS0 and CS1 pins are not
available for CSA functions
when OSC1 and OSC2 are
used; i.e. external crystal osc.
option is used.
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