參數(shù)資料
型號(hào)： DS2890X-000
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 7/27頁(yè)
文件大?。?/td> 0K
描述： IC POT DIGITAL 1-WIRE 100K CSP
標(biāo)準(zhǔn)包裝： 10,000
接片： 256
電阻（歐姆）： 100k
電路數(shù)： 1
溫度系數(shù)： 標(biāo)準(zhǔn)值 800 ppm/°C
存儲(chǔ)器類型： 易失
接口： 1 線 串行
電源電壓： 2.8 V ~ 6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 6-XBGA，F(xiàn)CBGA
供應(yīng)商設(shè)備封裝： 6-覆晶（2.82x2.54）
包裝： 帶卷 (TR)
DS2890
15 of 27
SEARCH ROM [F0H]
When a multi-drop system is initially brought up, the bus master might not know the number of devices
on the 1-Wire bus or their 64-bit ROM codes. The search ROM command allows the bus master to use a
process of elimination to identify the 64-bit ROM codes of all slave devices on the bus. The search ROM
process is the repetition of a simple 3-step routine: read a bit, read the complement of the bit, then write
the desired value of that bit. The bus master performs this 3-step routine on each bit of the ROM. After
one complete pass, the bus master knows the 64-bit ROM code of one device. Additional passes will
identify the ROM codes of the remaining devices.
CONDITIONAL SEARCH ROM [ECH]
The Conditional Search ROM command operates similarly to the Search ROM command except that only
devices fulfilling the specified search condition will participate in the search. The device condition that
will cause individual DS2890s to participate in a Conditional Search is a wiper position located at the
power-on default setting (00h).
This feature enables the bus master to easily determine whether a
potentiometer has gone through a power-on reset and needs to be re-configured with a required wiper
position setting.
SKIP ROM [CCH]
This command can save time in a single drop bus system by allowing the bus master to access
potentiometer functions without providing the 64-bit ROM code. If more than one slave is present on the
bus and, for example, a read command is issued following the Skip ROM command, data collision will
occur on the bus as multiple slaves transmit simultaneously (open drain pull-downs will produce a wired-
AND result).
OVERDRIVE SKIP ROM [3CH]
On a single-drop bus this command can save time by allowing the bus master to access the memory
functions without providing the 64-bit ROM code.
Unlike the normal Skip ROM command the
Overdrive Skip ROM sets the DS2890 in the Overdrive Mode.
All communication following this
command code has to occur at Overdrive Speed until a reset pulse of minimum 480 s duration resets all
devices on the bus to regular speed.
When issued on a multi-drop bus this command will set all Overdrive-supporting devices into Overdrive
mode. To subsequently address a specific Overdrive-supporting device, a reset pulse at Overdrive speed
has to be issued followed by a Match ROM or Search ROM command sequence. This will speed up the
search process. If more than one Overdrive-supporting slave is present on the bus and the Overdrive Skip
ROM command is followed by a read command, data collision will occur on the bus as multiple slaves
transmit simultaneously (open drain pull-downs will produce a wire-AND result).
OVERDRIVE MATCH ROM [69H]
The Overdrive Match ROM command, followed by a 64-bit ROM sequence transmitted at Overdrive
Speed, allows the bus master to address a specific DS2890 on a multi-drop bus and to simultaneously set
it in Overdrive Mode. Only the DS2890 that exactly matches the 64-bit ROM sequence will respond to
the subsequent potentiometer function command. Slaves already in Overdrive mode from a previous
Overdrive Skip or a successful Overdrive Match command will remain in Overdrive mode. All Over-
drive-capable slaves will return to regular speed at the next Reset Pulse of minimum 480 s duration. The
Overdrive Match ROM command can be used with a single or multiple devices on the bus.
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