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參數資料
| 型號： | 935261615118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO28 |
| 封裝： | 7.50 MM, PLASTIC, SO-28 |
| 文件頁數： | 10/48頁 |
| 文件大小： | 356K |
| 代理商： | 935261615118 |
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1998 Oct 06
18
Philips Semiconductors
Preliminary specication
Universal Serial Bus (USB)
Digital-to-Analog Converter (DAC)
UDA1321
Fig.6 Diode matrix selection.
handbook, full pagewidth
MGM109
10 nF
22 pF
4
6
5
3
2
1
USB-B
connector
Vbus
22
22
D
GP5
GP3
GP0
D
+
1.5 k
22 k
22 k
22 k
22 k
22 k
22 k
TR3
TR1
TR2
3.3 V
22 k
Vbus
1
2
D2
1
2
D1
KEY 1
SW1
KEY 2
SW2
Start-up and conguration of the UDA1321
START-UP OF THE UDA1321
After power-on, an internal power-on reset signal becomes
HIGH after a certain RC-time (R = 5 k
and C = Cref).
During 10 ms after power-on reset the UDA1321 has to
initiate the internal settings. After the power-on reset the
UDA1321 becomes master of the I2C-bus. The UDA1321
tries to read the eventually connected EEPROM and if an
EEPROM is detected, the internal descriptors are
overwritten and the selected port configuration is applied.
If no EEPROM is detected, the UDA1321 tries to read the
logical levels of GP3 and GP0. A choice can be made from
four configuration maps via these two pins.
CONFIGURATION SELECTION OF THE UDA1321 VIA A DIODE
MATRIX
The UDA1321 uses a configuration map to hold a number
of specific configurable data on hardware, product,
component and USB configuration level. At start-up
without EEPROM, the UDA1321 will scan the logical levels
of GP3 and GP0. With these two pins it is possible to
select one of the four possible (vendor specific)
configuration maps. This selection can be achieved via a
diode matrix (see Fig.6).
After selecting a configuration map the user cannot
change the chosen settings for the GP pins, internal
configuration, descriptors, etc.
For more information about the four (vendor specific)
configuration maps and the diode matrix see the
application documentation.
CONFIGURATION OPTIONS OF THE UDA1321 VIA AN I2C-BUS
EEPROM
If an EEPROM is detected (reading byte 0 as AAH and
byte 1 as 55H), the UDA1321 will use the configuration
map in the EEPROM instead of one of four configuration
maps. The layout of the configuration map is fixed, the
values (except bytes 0 and 1) are user definable (see
Table 6). If the user wants to change these values
(the manufacturers name for instance), this can be
achieved via the EEPROM code.
The communication between the UDA1321 and the
external I2C-bus device is based on the standard I2C-bus
protocol given in the Philips specification
“The I2C-bus and
how to use it (including specifications)”, which can be
ordered using the code 9398 393 40011. The I2C-bus has
two lines: a clock line SCL and a serial data line SDA
(see Fig.7).
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