DS3510 Maxim Integrated Products, DS3510 Datasheet - Page 11

• Manufacturer Part Number: DS3510
• Manufacturer: Maxim Integrated Products

like the other modes, the LD pin determines when the
DACs get updated. If the LD signal is high, Latch B is
flow-through and the DAC is updated immediately. If
LD is low, Latch B will be loaded from Latch A after a
low-to-high transition on the LD pin. This latter method
allows the timing of the DAC update to be controlled by
an external signal pulse.
As illustrated in the Block Diagram , the V
gamma channel outputs are equivalent to an 8-bit digi-
tal potentiometer (DAC) with a buffered output. The
V
255 equal resistive elements. The relationship between
output voltage and DAC setting is illustrated in Table 3.
Unlike the gamma channels, the V
capable of outputting a range of voltages including
both references (VRH and VRL). Each of the gamma
channel digital potentiometers, on the other hand, are
comprised of 256 equal resistive elements. The extra
resistive element prohibits one of the rails from being
reached. In particular, gamma channel outputs
GM1–GM5 can span from (and including) GLL to 1 LSB
away from GLM. Likewise, gamma channel outputs
GM6–GM10 span from (and including) GHM to 1 LSB
away from GHH. The relationship between output volt-
age and DAC setting for the gamma channels is also
illustrated in Table 3.
Standby mode (not to be confused with the three
DS3510 operating modes) can be used to minimize
current consumption. Standby mode is entered by set-
ting the standby bit, which is the LSB of register 51h.
The V
Table 3. DAC Voltage/Data Relationship for Selected Codes
COM
SETTING
(HEX)
FDh
00h
01h
02h
03h
0Fh
3Fh
7Fh
FEh
FFh
COM
channel’s digital potentiometer is comprised of
and gamma outputs are placed in a high-
I
2
V
C Gamma and V
COM
VRL + (127/255) x (VRH - VRL)
VRL + (253/255) x (VRH - VRL)
VRL + (254/255) x (VRH - VRL)
VRL + (15/255) x (VRH - VRL)
VRL + (63/255) x (VRH - VRL)
______________________________________________________________________________________
VRL + (1/255) x (VRH - VRL)
VRL + (2/255) x (VRH - VRL)
VRL + (3/255) x (VRH - VRL)
V
COM
/Gamma Channel Outputs
OUTPUT VOLTAGE
VRH
VRL
Standby Mode
COM
channel is
COM
GM1–GM5 OUTPUT VOLTAGE
GLL + (127/256) x (GLM - GLL)
GLL + (253/256) x (GLM - GLL)
GLL + (254/256) x (GLM - GLL)
GLL + (255/256) x (GLM - GLL)
and
GLL + (15/256) x (GLM - GLL)
GLL + (63/256) x (GLM - GLL)
GLL + (1/256) x (GLM - GLL)
GLL + (2/256) x (GLM - GLL)
GLL + (3/256) x (GLM - GLL)
COM
impedance state. Current drawn from the V
this state is specified as I
The DS3510 continues to respond to I
and thus draws some current from V
ty is occurring. When the I
rent drawn from the V
As a safety feature, the DS3510 goes into a thermal
shutdown state if the junction temperature ever reaches
or exceeds +150°C. In this state, the V
disabled (output goes high impedance) until the junc-
tion temperature falls below +150°C.
The slave address byte consists of a 7-bit slave
address plus a R/W bit (see Figure 5). The DS3510’s
slave address is determined by the state of the A0 pin.
This pin allows up to two devices to reside on the same
I
responding bit position in the slave address.
Conversely, connecting A0 to V
corresponding bit position. For example, the DS3510’s
slave address byte is C0h when A0 is grounded. I
communication is described in detail in the I
Interface Description section.
Figure 5. DS3510 Slave Address Byte
2
C bus. Connecting A0 to GND results in a 0 in the cor-
GLL
Buffer with EEPROM
*THE SLAVE ADDRESS IS DETERMINED BY ADDRESS PIN A0.
Slave Address Byte and Address Pin
MSB
1
1
CC
SLAVE ADDRESS*
0
GHM + (255/256) x (GHH - GHM)
GHM + (254/256) x (GHH - GHM)
GHM + (253/256) x (GHH - GHM)
GHM + (252/256) x (GHH - GHM)
GHM + (240/256) x (GHH - GHM)
GHM + (192/256) x (GHH - GHM)
GHM + (128/256) x (GHH - GHM)
GM6–GM10 OUTPUT VOLTAGE
supply is specified as I
GHM + (2/256) x (GHH - GHM)
GHM + (1/256) x (GHH - GHM)
DDQ
0
2
C interface is inactive, cur-
.
0
Thermal Shutdown
CC
0
results in a 1 in the
GHM
CC
when I
A0
2
C commands,
COM
DD
LSB
R/W
2
2
supply in
buffer is
C activi-
C Serial
CCQ
.
2
11
C