Smbus Slave Mode; Ds1Xxdf111Evm Slave Mode Full Setup; Ds1Xxdf111Evm Slave Mode Close-Up - Texas Instruments DS125DF111EVM User Manual

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5.2

SMBus Slave Mode

The SMBus can also be used to control DS125DF111 devices. This method has the advantage of
independent channel control and finer signal conditioning granularity.
1. J17 – GND
2. J19 – V to V
IN IH
3. J15 – V = 3.3 V: Use internal regulator to convert 3.3 V supply to internal supply level of 2.5 V
IN
NOTE: The 2.5V level may be observed on J18 (V
J18 (V
DD
4. Floating the AD[1:0] inputs will result in an SMBus address = 00 = 30'h
5. J3 – ENSMB = H: SMBus Slave Mode
6. Connect the board signals SDA, SCL, and GND on J20 to a DPS-DONGLE-EVM or an equivalent
USB2ANY device. A pull-up resistor is needed on the SMBus clock and data signals; place jumpers on
pins 1-2 of J4 and J5 to connect a 1 kΩ pull-up resistor to SCL and SDA. The address line settings on
J16 (ADR0) and J10 (ADR1) are pin strap settings which get latched on power up and retain their
value until the DS125DF111 is power cycled.
7. The DS125DF111's control and signal integrity settings are programmable with SigCon Architect, a
GUI which supports full register access through SMBus communication. An example of a
DS1xxDF111EVM connected to a PC through a DPS-DONGLE-EVM is shown in
Figure 4. The possible SMBus address settings are shown in
SigCon Architect, reference the "SigCon Architect: Installation and Starter's Guide" (SNLU178).
DS125DF111 profile in SigCon Architect
DS1xxDF111EVM
DPS-DONGLE-EVM
Figure 3. DS1xxDF111EVM Slave Mode Full Setup
SNLU158A – January 2014 – Revised January 2016
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: 3.3 V supply operation (2.5 V internal regulator is enabled)
) is a regulated output voltage. Do not connect a 2.5 V supply to this pin.
PC running either DS110DF111 or
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) or the device V pins. While in 3.3 V mode,
DD DD
Table 5. For more information about
DS1xxDF111EVM
SMBus Pin Headers
SCL
SDA
GND
Figure 4. DS1xxDF111EVM Slave Mode Close-Up
DS125DF111EVM Evaluation Board
Setup
Figure 3 and
DPS-DONGLE-EVM
SMBus Pin Headers
SCL | SDA | GND
9