参数资料
型号: ZL2008ALAFT
厂商: Intersil
文件页数: 29/42页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 36-QFN
标准包装: 100
PWM 型: 电压模式
输出数: 1
频率 - 最大: 1.4MHz
占空比: 95%
电源电压: 3 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 36-VFQFN 裸露焊盘
包装: 带卷 (TR)
ZL2008
I 2 C/SMBus Device Address Selection
When communicating with multiple SMBus devices using the
I 2 C/SMBus interface, each device must have its own unique
address so the host can distinguish between the devices. The
device address can be set according to the pin-strap options
listed in Table 22. Address values are right-justified.
If more than 25 unique device addresses are required or if other
SMBus address values are desired, both the SA0 and SA1 pins
can be configured with a resistor to SGND according to
Equation 34 and Table 24.
SMBus address = 25 x (SA1 index) + (SA0 index) (in decimal)
(EQ. 34)
TABLE 22. SMBus Address Pin-strap Selection
SA0
LOW OPEN
HIGH
TABLE 24. SMBus Address Index Values
R SA
(k Ω ) SA0 or SA1 Index
LOW
0x20
0x21
0x22
10
0
SA1
OPEN
HIGH
0x23
0x26
0x24
0x27
0x25
Reserved
11
12.1
1
2
If additional device addresses are required, a resistor can be
connected to the SA0 pin according to Table 23 to provide up to
25 unique device addresses. In this case, the SA1 pin should be
tied to SGND.
TABLE 23. SMBus Address Resistor Selection
13.3
14.7
16.2
17.8
3
4
5
6
R SA0
(k Ω )
10
11
12.1
13.3
14.7
16.2
17.8
19.6
21.5
23.7
26.1
28.7
31.6
34.8
38.3
42.2
46.4
SMBus
Address
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
0x10
19.6
21.5
23.7
26.1
28.7
31.6
34.8
38.3
42.2
46.4
51.1
56.2
61.9
68.1
75
82.5
90.9
100
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
51.1
56.2
61.9
68.1
75
82.5
90.9
100
29
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
Using this method, the user can theoretically configure up to 625
unique SMBus addresses, however the SMBus is inherently
limited to 128 devices so attempting to configure an address
higher than 128 (0x80) will cause the device address to repeat
(i.e., attempting to configure a device address of 129 (0x81)
would result in a device address of 1). Therefore, the user should
use index values 0-4 on the SA1 pin and the full range of index
values on the SA0 pin, which will provide 125 device address
combinations.
Note that the SMBus address 0x4B is reserved for device test and
cannot be used in the system.
FN6859.4
April 29, 2011
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