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| 型号： | LTC4261IUFD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 22/34页 |
| 文件大小： | 361K |
| 描述： | IC CTRLR HOTSWAP W/ADC 24-QFN |
| 标准包装： | 73 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 9 V ~ 11.2 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN（5x4） |
| 包装： | 管件 |
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LTC4261/LTC4261-2
22
42612fc
Ejector Switch or Loop-Through Connection Sense.
Floating switch contacts or a connection sense loop also
work well with the ON pin, replacing the phototransistor
in Figure 9a. If an insertion debounce delay is desired,
use the EN pin as shown in Figure 9c. Like Figures 9a
and 9b, this circuit works on either side of the backplane
connector.
Short Pin to RTN. Figure 9d uses the UV divider string to
detect board insertion. This method works equally well in
both backplane and board resident applications.
AdvancedTCA Style Control. Figure 2 shows an ATCA
application using EN as the interface to the LTC4261.
Register bit A4 allows the I
2
C port to monitor the status
of EN and by setting C4 high, bit B4 can generate an alert
to instantly report any changes in the state of EN.
I
2
C Only Control. To lock out EN and ON, use the con-
fguration shown in Figure 9e and control the GATE pin
with register bit D3. The circuit defaults off at power up.
To default on, connect the ON pin to INTV
CC
. Either FLTIN
or PGIO can be used as an input to monitor a connection
sense or other control signal. PGIO is configured as an
input by setting register bits D6 and D7 high; its input
state is stored at location B6. FLTIN is always an input
whose state is available from register bit B7. FLTIN gen-
erates an alert if C7 is set high.
Data Converter
The LTC4261/LTC4261-2 incorporates a 10-bit D?ana-
log-to-digital converter (ADC) that continuously moni-
tors three different voltages at (in the sequence of)
SENSE, ADIN2/OV (SSOP/QFN) and ADIN. The D?ar-
chitecture inherently averages signal noise during the
measurement period. The voltage between the SENSE
pin and V
EE
is monitored with a 64mV full scale and
62.5礦 resolution, and the data is stored in registers E
and F. The ADIN and the ADIN2/OV pins are monitored
with a 2.56V full scale and 2.5mV resolution. The data
for the ADIN2/OV pin is stored in registers G and H. The
data for the ADIN pin is stored in registers I and J.
The results in registers E, F, G, H, I and J are updated at
a frequency of 7.3Hz. Setting CONTROL register bit D5
invokes a test mode that halts updating of these registers
so that they can be written to and read from for software
testing. By invoking the test mode right before reading
the ADC data registers, the 10-bit data separated in two
registers are synchronized.
The ADIN and ADIN2 pins can be used to monitor input
and output voltages of the Hot Swap controller as shown
in Figures 1 and 2.
Figure 9. On/Off Control of the LTC4261
APPLICATIONS INFORMATION
INTV
CC
LTC4261
(9a) Opto-Isolator Control
5V
ON
47k
1k
EN
48V
V
EE
INTV
CC
LTC4261
(9c) Contact Debounce Delay Upon
Insertion for Use with an Ejector
Switch or Loop-Through Style
Connection Sense
EN
100k
LOOP OR
SWITCH
10nF
1M
ON
48V
V
EE
INTV
CC
LTC4261
(9b) Logic Control
ON
EN
48V
V
EE
INTV
CC
I
2
C
42612 F09
LTC4261
(9e) I
2
C-Only Control
ON
EN
SDAO
SDAI
SCL
DEFAULT
ON
DEFAULT
OFF
48V
V
EE
INTV
CC
LTC4261
(9d) Short Pin Connection Sense to RTN
ON
EN
UVL
UVH
28.7k
48V
INPUT
48V
RTN
V
EE
453k
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