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PDF DS1052 Data sheet ( Hoja de datos )
| Número de pieza | DS1052 | |
| Descripción | 5-Bit / Programmable / 100kHz Pulse-Width Modulator | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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DS1052
5-Bit, Programmable, 100kHz
Pulse-Width Modulator
FEATURES
§ Single 5-bit, programmable, pulse-width
modulator (PWM)
§ Adjustable Duty Cycle: 0% to 100%
§ 2.7V to 5.5V Operation
§ Standard Frequency Value: 100kHz
§ 2-Wire Addressable Interface
§ Packages: 8-Pin (150-mil) SOIC and 8-Pin
(118-mil) mSOP
§ Operating Temperature: -40oC to +85oC
ORDERING INFORMATION
DS1052Z-100
100kHz 8-Pin 150-mil SOIC
DS1052U-100 100kHz 8-Pin 118-mil mSOP
PIN ASSIGNMENT
SCL 1
8 VCC
SDA
2
7 A1
A0 3
6 A2
GND
4
5 PWMo
8-Pin 150-mil SOIC
8-Pin 118-mil mSOP
PIN DESCRIPTION
VCC
PWMO
A0, A1, A2
- 2.7V to 5.5V Power Supply
- PWM Ouput
- Device Address
SDA
- Serial Data I/O
SCL - Serial Clock Input
GND
- Ground
DESCRIPTION
The DS1052 is a programmable, 5-bit, pulse-width modulator featuring a 2-wire addressable controlled
interface. The DS1052 operates from power supplies ranging from 2.7V up to 5.5V. The PWM output
provides a signal that swings from 0V to VCC.
The DS1052-100 requires a typical operating current of 100µA and a programmable shutdown supply
current of 1µA.
One standard PWM output frequency is offered: 100kHz. The 2-wire addressable interface allows
operation of multiple devices on a single 2-wire bus and provides compatibility with other Dallas
Semiconductor 2-wire devices such as real-time clocks (RTCs), digital thermometers, and digital
potentiometers.
The device is ideal for low-cost LCD contrast and/or brightness control, power supply voltage
adjustment, and battery charging or current adjustment. The DS1052 is offered in standard integrated
circuit packaging, including the 8-pin (150-mil) SOIC and space-saving 8-pin (118-mil) mSOP.
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1 page  
DS1052
The command operation “Set Shutdown Mode” is used to provide a low-current (inactive state) state for
the DS1052. When in a low-current state the DS1052 will draw currents less than or equal to 1mA. The
PWMO output will be high impedance.
The command operation “Set Recall Mode” is used to recall the DS1052 from a low-current state. The
value of the PWMO output is recalled to that prior to initiating a “Set shutdown mode” command.
The “Read PWM Duty Cycle” command is used to read the current setting of the PWM configuration
register. Information returned by this command includes PWM output value as well as whether the device
is in a shutdown configuration.
PWM data values and control/command values are always transmitted most significant bit (MSB) first.
During communications, the receiving unit always generates the “acknowledge.”
READING THE DS1052
As shown in Figure 4e, the DS1052 provides one read command operation. This operation allows the
user to read the current setting of the PWM configuration register. Specifically, the R/W bit of the
command/control byte is set equal to a 1 for a read operation. Communication to read the DS1052 begins
with a START condition which is issued by the master device. The command/control byte from the
master device will follow the START condition. Once the command/control byte has been received by
the DS1052, the part will respond with an ACKNOWLEDGE. The read/write bit of the command/control
byte, as stated, should be set equal to 1 for reading the DS1052.
When the master has received the ACKNOWLEDGE from the DS1052, the master can then begin to
receive the PWM configuration register data. As mentioned this data will be transmitted MSB first. Once
the eight bits of the PWM configuration register have been transmitted, the master will need to issue an
ACKNOWLEDGE, unless it is the only byte to be read, in which case the master issues a NOT
ACKNOWLEDGE. If desired the master may stop the communication transfer at this point by issuing the
STOP condition. Final communication transfer is terminated by issuing the STOP command. Again, the
flow of the read operation is presented in Figure 4e.
WRITING THE DS1052
A data flow diagram for writing the DS1052 is shown in Figures 4a, b, c, and d. The DS1052 has three
write commands that are used to change the PWM configuration register or the shutdown and recall mode
of the device.
All the write operations begin with a START condition. Following the START condition, the master
device will issue the command/control byte. The read/write bit of the command/control byte will be set to
“0” for writing the DS1052. Once the command/control byte has been issued and the master receives the
acknowledgment from the DS1052, PWM configuration data is transmitted to the DS1052 by the master
device.
A data byte for the DS1052 will contain PWM configuration data and shutdown/recall command data.
The five least significant bits of data specify the PWM configuration value while the three most
significant bits specify the whether the device is to be shutdown or recalled. When the DS1052 has
received the data byte, it will respond with an ACKNOWLEDGE. At this point, the new PWM
configuration register value and shutdown/recall command value will be updated in the DS1052. The
master device, after the receipt of the ACKNOWLEDGE, can continue to transmit additional data bytes
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DS1052 COMMANDS AND PROTOCOL Figure 4
SET PWM DUTY CYCLE
(a)
MSB
S
ST
AA
R
T
S
T
A
R
0
T
1
CONTROL
BYTE
LSB
A
0 1 A2 A1 A0 0 C
K
R/W=0
MSB
PWM
DATABYTE
LSB
0 0 0 PWM Data
DS1052
S
T
O
P
MSB
CONTROL
BYTE
LSB
MSB
PWM
DATABYTE
LSB
S
(b) T A
A 0 1 0 1 A2 A1 A0 0 C
R
T
K
0 0 1 Don't Care
S
T
O
P
R/W=0
SET SHUT-DOWN MODE
(c)
MSB
CONTROL
BYTE
LSB
S
T
A
S
T
0
1
0
1 A2 A1 A0 0
A
C
RA
TR
K
T R/W=0
MSB
PWM
DATABYTE
LSB
1 1 0 Don't Care
S
T
O
P
RECALL MODE
(d)
MSB
CONTROL
BYTE
LSB
S
T
A
01
0 1 A2 A1 A0 0
A
C
R
T
K
R/W=0
MSB
PWM
DATABYTE
LSB
1 0 0 Don't Care
S
T
O
P
CONTROL
BYTE
MSB
LSB
READ PWM DUTY CYCLE S
(e) T
A
R
T
0 1 0 1 A2 A1 A0 1
A
C
K
R/W=1
MSB
PWM
DATABYTE
LSB
0 0 0 PWM-DATA
S
T
O
P
11 of 14
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet DS1052.PDF ] | |
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