LTC4240IGN#PBF Linear Technology, LTC4240IGN#PBF Datasheet - Page 12

• Manufacturer Part Number: LTC4240IGN#PBF
• Description: IC CTRLR HOTSWAP CPCI I2C 28SSOP
• Manufacturer: Linear Technology
• Type: Hot-Swap Controllerr

Specifications of LTC4240IGN#PBF

• Applications: CompactPCI™
• Internal Switch(s): No
• Voltage - Supply: 3.3V, 5V, ±12V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP (0.150", 3.95mm Width)
• Family Name: LTC4240
• Package Type: SSOP N
• Operating Supply Voltage (min): 2.55/4.45/10.8/-10.5V
• Operating Supply Voltage (max): 5/12/14/-14V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Product Depth (mm): 3.99mm
• Product Height (mm): 1.5mm
• Mounting: Surface Mount
• Pin Count: 28
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LTC4240
APPLICATIO S I FOR ATIO
used to turn off/on the power switches, turn on the status
LED (alerting the user that its safe to remove the plug-in
board), and assert the LOCAL_PCI_RST# signal. The I
bus is also used to read the logic signals of several device
pins: FAULT, PWRGD, RESETIN, and RESETOUT. Addi-
tionally, when a supply generates a current fault, the I
bus can be used to determine which supply generated the
fault. See Send Byte and Receive Byte sections for a full
description of all I
The LTC4240 supports Send Byte and Receive Byte proto-
cols. Communication is achieved using the SCL and SDA
pins (TTL compatible input thresholds). The SCL pin is the
clock input from the I
The maximum SCL frequency is 100kHz. SDA is the
bidirectional data transfer line between the I
LTC4240. Send Byte and Receive Byte protocols are both
comprised of 2 bytes. The first byte for both is the address
byte. All communication begins with a START command.
Programming the I
The voltage on the ADDRIN pin determines the I
dress. The ADDRIN voltage is set externally with a resistor
divider from 5V
close to the pin, do not place a bypass capacitor on
ADDRIN). This voltage is fed to a 5-bit A/D and compared
against the address byte clocked in by the I
bit A/D allows 32 unique LTC4240 devices to be connected
on the same I
the voltage at ADDRIN approximately 0.5 LSB away from
each code transition. Table 1 shows recommended resis-
tor values for each of the address code segments. The
resistor ratio for each code segment has been optimized
for best performance over the specified temperature range.
The parallel resistance for the address setting resistors
should be kept under 10k.
12
2
C bus. 1% resistors should be used to place
IN
to ground (resistor placement must be
2
C features.
U
2
2
C Address
C bus (host) to the LTC4240 (slave).
U
W
2
2
C bus. The 5-
C bus and the
U
2
C ad-
2
2
C
C
Table 1. Suggested ADDRIN 1% Resistor Values
ADDR RECOMMENDED ALLOWED ADDRIN
CODE ADDRIN VOLTAGE VOLTAGE RANGE
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
0.108125
0.264375
0.420625
0.576875
0.733125
0.889375
1.045625
1.201875
1.358125
1.514375
1.670625
1.826875
1.983125
2.139375
2.295625
2.451875
2.608125
2.764375
2.920625
3.076875
3.233125
3.389375
3.545625
3.701875
3.858125
4.014375
4.170625
4.326875
4.483125
4.639375
4.795625
4.951875
0.080 to 0.136
0.236 to 0.293
0.393 to 0.449
0.549 to 0.605
0.705 to 0.761
0.861 to 0.918
1.018 to 1.074
1.174 to 1.230
1.330 to 1.386
1.486 to 1.543
1.643 to 1.699
1.799 to 1.860
1.955 to 2.021
2.111 to 2.175
2.268 to 2.330
2.424 to 2.488
2.580 to 2.644
2.736 to 2.800
2.888 to 2.950
3.044 to 3.110
3.200 to 3.262
3.356 to 3.421
3.513 to 3.574
3.669 to 3.731
3.825 to 3.886
3.981 to 4.041
4.138 to 4.190
4.294 to 4.349
4.450 to 4.499
4.606 to 4.651
4.763 to 4.805
4.919 to 4.962
RESISTOR RESISTOR
R
19(TOP)
8660
2550
2550
2550
2550
2550
3830
2550
2550
1150
1020
8660
2550
2550
1130
1370
2550
2550
2550
1150
1150
1150
2550
1070
715
357
249
178
133
102
105
100
R
10000
20(BOT)
1020
4990
1690
1910
1130
1330
2800
3160
3570
1150
2100
2430
2800
1020
8660
1020
5360
1150
1150
1300
2430
191
140
237
332
442
549
806
953
499
511
4240f