參數(shù)資料
型號(hào)： MC33984
廠商： 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述： Dual Intelligent High-Current Self-Protected Silicon High-Side Switch (4.0 mOhm)(雙智能大電流帶自保護(hù)功能的硅高端開關(guān)（4mOhm）)
中文描述： 雙智能大電流的自我保護(hù)硅高邊開關(guān)（4.0毫歐）（雙智能大電流帶自保護(hù)功能的硅高端開關(guān)（4mOhm））
文件頁(yè)數(shù)： 17/24頁(yè)
文件大?。?/td> 783K
代理商： MC33984
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33984
17
Device Register Addressing
The following section describes the possible register
addresses and their impact on device operation.
Address x000—Status Register (STATR)
The START register is used to read the device status and the
various configuration register contents without disrupting the
device operation or the register contents. The register bits D2,
D1, D0 determine the content of the first eight bits of SO data.
When the register content is specific to one of the two outputs,
the bit D7 is used to select the desired output. In addition to the
device status, this feature provides the ability to read the
content of the OCR, SOCHLR, CDTOLR, DICR, OSDR, WDR
,
NAR, and UOVR registers. (Refer to the section entitled
Serial
Output Communication (Device Status Return Data)
beginning
on page 19.)
Address x001—Output Control Register (OCR)
The OCR register allows the MCU to control the outputs
through the SPI. Incoming message bit D0 reflects the desired
states of the high-side output HS0 (IN_SPI): a logic [1] enables
the output switch and a logic [0] turns it OFF. A logic [1] on
message bit D1 enables the Current Sense (CSNS) terminal.
Similarly, incoming message bit D2 reflects the desired states
of the high-side output HS1 (IN_SPI). A logic [1] enables the
output switch and a logic [0] turns it OFF. A logic [1] on
message bit D3 enables the CSNS terminal. In the event that
the current sense is enabled for both outputs, the current will be
summed. Bit D7 is used to feed the watchdog if enabled.
Address x010— Select Overcurrent High and Low Register
(SOCHLR)
The SOCHLR register allows the MCU to configure the
output overcurrent low and high detection levels, respectively.
Each output is independently selected for configuration based
on the state of the D7 bit; a write to this register when D7 is
logic [0] will configure the current detect levels for the HS0.
Similarly, if D7 is logic [1] when this register is written, HS1 is
configured. Each output can be configured to different levels. In
addition to protecting the device, this slow blow fuse emulation
feature can be used to optimize the load requirements matching
system characteristics. Bits D2–D0 set the overcurrent low
detection level to one of eight possible levels, as shown in
Table 3
. Bit D3 sets the overcurrent high detection level to one
of two levels, which is described in
Table 4
.
Address x011—Current Detection Time and Open Load
Register (CDTOLR)
The CDTOLR register is used by the MCU to determine the
amount of time the device will allow an overcurrent low
condition before output latches OFF occurs. Each output is
independently selected for configuration based on the state of
the D7 bit. A write to this register when bit 7 is logic [0] will
configure the timeout for the HS0. Similarly, if D7 is logic [1]
when this register is written, then HS1 is configured. Bits D1–
D0 allow the MCU to select one of four fault blanking times
defined in
Table 5
, page 18. Note that these timeouts apply only
to the overcurrent low detection levels. If the selected
overcurrent high level is reached, the device will latch off within
20
μ
s.
Table 2. Serial Input Address and Configuration Bit Map
SI
Register
Serial Input Data
D7 D6 D5 D4
D3
D2
D1
D0
STATR
SO
A3
0
0
0
0
SOA2
SOA1
SOA0
OCR
x
0
0
1
CSNS1
EN
IN1_SPI
CSNS0
EN
IN0_SPI
SOCHLR
s
0
1
0
SOCHs
SOCL2s
SOCL1s
SOCL0s
CDTOLR
s
0
1
1
OL DIS s CD DISs
OCLT1s
OCLT0s
DICR
s
1
0
0
FAST
SRs
CSNS
highs
IN DIS s
A/Os
OSDR
0
1
0
1
0
OSD2
OSD1
OSD0
WDR
1
1
0
1
0
0
WD1
WD0
NAR
0
1
1
0
0
0
0
0
UOVR
1
1
1
0
0
0
UV_dis
OV_dis
TEST
x
1
1
1
Motorola Internal Use (Test)
x = Don’t care.
s = Selection of output: logic [0] = HS0, logic [1] = HS1.
Table 3. Overcurrent Low Detection Levels
SOCL2
(D2)
SOCL1
(D1)
SOCL0
(D0)
Overcurrent Low Detection
(Amperes)
0
0
0
25
0
0
1
22.5
0
1
0
20
0
1
1
17.5
1
0
0
15
1
0
1
12.5
1
1
0
10
1
1
1
7.5
Table 4. Overcurrent High Detection Levels
SOCH (D3)
Overcurrent High Detection
(Amperes)
0
100
1
75
F
Freescale Semiconductor, Inc.
Go to: www.freescale.com
n
.
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MC33984CHFK 功能描述:電源開關(guān) IC - 配電 Dual 4mOhms smart RoHS:否 制造商:Exar 輸出端數(shù)量:1 開啟電阻（最大值）:85 mOhms 開啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5
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