參數(shù)資料
型號(hào)： ADM1025ARQZ-R7
廠商： ON Semiconductor
文件頁數(shù)： 19/19頁
文件大小： 0K
描述： IC MONITOR SYS/VOLT 5CH 16QSOP
產(chǎn)品變化通告： MFG CHG Notification ADI to ON Semi
Product Obsolescence 11/Feb/2009
標(biāo)準(zhǔn)包裝： 1,000
應(yīng)用： PC，PDA
接口： I²C
電源電壓： 3 V ~ 5.5 V
封裝/外殼： 16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-QSOP
包裝： 帶卷 (TR)
安裝類型： 表面貼裝
ADM1025, ADM1025A
http://onsemi.com
9
Figure 11. Writing to the Address Pointer Register Only
0
SCL
SDA
10
1
A1
A0
D7
D6
D5
D4
D3
D2
D1
D0
ACK. BY
ADM1025
START BY
MASTER
19
1
ACK. BY
ADM1025
9
STOP BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
R/W
Figure 12. Reading Data from a Previously Selected Register
SCL
SDA
D7
D6
D5
D4
D3
D2
D1
D0
NO ACK.
BY MASTER
START BY
MASTER
9
1
ACK. BY
ADM1025
9
STOP BY
MASTER
0
1
0
1
A1
A0
1
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
DATA BYTE FROM ADM1025
R/W
When reading data from a register there are two
possibilities:
1. If the ADM1025/ADM1025A’s Address Pointer
Register value is unknown or not the desired
value, it is first necessary to set it to the correct
value before data can be read from the desired data
register. This is done by performing a write to the
ADM1025/ADM1025A as before, but only the
data byte containing the register address is sent,
since data should not be written to the register.
This is shown in Figure 11.
A read operation is then performed consisting of
the serial bus address, R/W bit set to 1, followed
by the data byte read from the data register. This is
shown in Figure 12.
2. If the Address Pointer Register is known to be
already at the desired address, data can be read
from the corresponding data register without first
writing to the Address Pointer Register, so
Figure 11 can be omitted.
NOTES:
1. Although it is possible to read a data byte from a data
register without first writing to the Address Pointer Register,
if the Address Pointer Register is already at the correct
value, it is not possible to write data to a register without
writing to the Address Pointer Register because the first
data byte of a write is always written to the Address Pointer
Register.
2. In Figure 10 to Figure 12, the serial bus address is shown
as the default value 01011(A1)(A0), where A1 and A0 are
set by the three-state ADD pin.
3. In addition to supporting the Send Byte and Receive Byte
protocols, the ADM1025/ADM1025A also supports the
Read Byte protocol (see System Management Bus
specifications Rev. 1.1 for more information).
4. If Reset or interrupt functionality is required, the address pin
cannot be strapped to GND, since this would keep the
ADD/RST/INT/NTO pin permanently low.
Figure 13. Structure of Analog Inputs
62.6 kW
82.4 kW
3.3VIN
25 pF
91.6 kW
55.2 kW
5VIN
25 pF
122.2 kW
22.7 kW
12VIN
35 pF
MUX
36.7 kW
111.2 kW
2.5VIN
25 pF
19.6 kW
105 kW
VCCPIN
10 pF
Measurement Inputs
The
ADM1025/ADM1025A
has
six
external
measurement inputs, five for voltage and one (two pins) for
temperature. Internal measurements are also carried out on
VCC and the on-chip temperature sensor.
A/D Converter
These inputs are multiplexed into the on-chip,
successive-approximation, analog-to-digital converter. This
has a resolution of eight bits. The basic input range is 0 V to
2.5 V, but the inputs have built-in attenuators to allow
measurement of 2.5 V, 3.3 V, 5 V, 12 V, and the processor
core voltage VCCP without any external components. To
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