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PDF DS2484 Data sheet ( Hoja de datos )
| Número de pieza | DS2484 | |
| Descripción | Single-Channel 1-Wire Master | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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DS2484
Single-Channel 1-Wire Master
with Adjustable Timing and Sleep Mode
General Description
The DS2484 is an I2C-to-1-WireM bridge device that
interfaces directly to standard (100kHz max) or fast
(400kHz max) I2C masters to perform protocol con-
version between the I2C master and any downstream
1-Wire slave devices. Relative to any attached 1-Wire
slave device, the DS2484 is a 1-Wire master. Internal,
user-adjustable timers relieve the system host processor
from generating time-critical 1-Wire waveforms, support-
ing both standard and overdrive 1-Wire communication
speeds. In addition, the 1-Wire bus can be powered
down under software control. The dual-voltage operation
allows different operating voltages on the I2C and 1-Wire
side. Strong pullup features support 1-Wire power deliv-
ery to 1-Wire devices such as EEPROMs and sensors.
When not in use, the DS2484 can be put in sleep mode
where power consumption is minimal.
Applications
Printers
Medical Instruments
Industrial Sensors
Cell Phones
Benefits and Features
S I2C Host Interface Supports 100kHz and 400kHz
I2C Communication Speeds
S Standard and Overdrive 1-Wire Communication
Speeds
S Adjustable 1-Wire Timing for tRSTL, tMSP, tW0L,
and tREC0
S 1-Wire Port Can Be Powered Down Under
Software Control
S Supports Power-Saving Sleep Mode (SLPZ Pin),
Where the 1-Wire Port is in High Impedance
S I2C Operating Voltages: 1.8V ±5%, 3.3V ±10%, and
5.0V +5/-10%
S Built-In Level Translator: 1-Wire Operating Voltage
from 1.8V -5% to 5.0V +5%, Independent of I2C
Voltage
S Built-In ESD Protection Level of ±8kV Human
Body Model (HBM) Contact Discharge on IO Pin
S -40NC to +85NC Operating Temperature Range
S 8-Pin TDFN and 6-Pin SOT23 Packages
Ordering Information appears at end of data sheet.
Typical Application Circuit
3V
(I2C PORT)
µC
RP*
SDA
SCL
5V
VCC
DS2484
SLPZ
IO 1-Wire BUS
1-Wire
DEVICE #1
1-Wire
DEVICE #2
1-Wire
DEVICE #n
*RP = I2C PULLUP RESISTOR (SEE THE Pullup Resistor RP Sizing SECTION FOR RP SIZING)
1-Wire is a registered trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-6701; Rev 1; 7/15
1 page  
DS2484
Single-Channel 1-Wire Master
with Adjustable Timing and Sleep Mode
Pin Configurations
SCL 1
SDA 2
SLPZ 3
N.C. 4
TOP VIEW
DS2484
EP
8 GND
7 IO
6 VCC
5 N.C.
TDFN
(2mm x 3mm)
TOP MARK
2484
YMrr
TOP VIEW
VCC IO GND
654
DS2484
123
SLPZ SDA SCL
SOT23
“rr” = REVISION CODE
TOP MARK
3Hrr
Pin Description
PIN
TDFN-EP SOT23
13
22
31
4, 5 —
66
75
84
——
NAME
SCL
SDA
SLPZ
N.C.
VCC
IO
GND
EP
FUNCTION
I2C Serial-Clock Input. Must be connected to the I2C bus supply voltage through a pullup
resistor.
I2C Serial-Data Input/Output. Must be connected to the I2C bus supply voltage through a
pullup resistor.
Power Supply for I2C Port and Active-Low Control Input to Activate the Low-Power Sleep
Mode. This pin can be driven directly by a push-pull port or by an open-drain port with a
2.2kI pullup resistor to the I2C voltage (VCI2C) over the entire operating voltage range.
No Connection. Not internally connected.
Power-Supply Input
Input/Output Driver for 1-Wire Line
Ground Reference
Exposed Pad (TDFN Only). Solder evenly to the board’s ground plane for proper operation.
Refer to Application Note 3273: Exposed Pads: A Brief Introduction for additional information.
Maxim Integrated
5
5 Page 
DS2484
Single-Channel 1-Wire Master
with Adjustable Timing and Sleep Mode
Command Code
Command Parameter
Description
Typical Use
Restriction
Error Response
Command Duration
1-Wire Activity
Read Pointer Position
Status Bits Affected
Device Configurations Affected
Port Configurations Affected
Device Reset
F0h
None
Performs a global reset of device state machine logic. Terminates any ongoing 1-Wire
communication.
Device initialization after power-up; reinitialization (reset) as desired.
None (can be executed at any time)
None
Maximum 525ns. Counted from falling SCL edge of the command code acknowledge bit.
Ends maximum 262.5ns after the falling SCL edge of the command code acknowledge bit.
Status register (for busy polling).
RST set to 1; 1WB, PPD, SD, SBR, TSB, DIR set to 0.
1WS, APU, PDN, SPU set to 0.
tRSTL, tMSP, tW0L, tREC0, and RWPU default values apply.
Command Code
Command Parameter
Description
Typical Use
Restriction
Error Response
Command Duration
1-Wire Activity
Read Pointer Position
Status Bits Affected
Device Configurations Affected
Port Configurations Affected
Set Read Pointer
E1h
Pointer Code (see Table 5)
Sets the read pointer to the specified register. Overwrites the read pointer position of any
1-Wire communication command in progress.
To prepare reading the result from a 1-Wire Read Byte command; random read access of
registers.
None (can be executed at any time).
If the pointer code is not valid, the pointer code is not acknowledged and the command is
ignored.
None. The read pointer is updated on the rising SCL edge of the pointer code acknowledge bit.
Not affected.
As specified by the pointer code.
None
None
None
Table 5. Valid Read Pointer Codes
REGISTER
Device Configuration Register
Status Register
Read Data Register
Port Configuration Register
CODE
C3h
F0h
E1h
B4h
Maxim Integrated
11
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet DS2484.PDF ] | |
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