DPS-DONGLE-EVM
SMBus Pin Headers
SCL | SDA | GND
DS1xxDF111EVM
SMBus Pin Headers
SCL
SDA
GND
DPS-DONGLE-EVM
DS1xxDF111EVM
PC running either DS110DF111 or
DS125DF111 profile in SigCon Architect
Setup
9
SNLU158A – January 2014 – Revised January 2016
Copyright © 2014–2016, Texas Instruments Incorporated
DS125DF111EVM Evaluation Board
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
IN
to V
IH
: 3.3 V supply operation (2.5 V internal regulator is enabled)
3. J15 – V
IN
= 3.3 V: Use internal regulator to convert 3.3 V supply to internal supply level of 2.5 V
NOTE:
The 2.5V level may be observed on J18 (V
DD
) or the device V
DD
pins. While in 3.3 V mode,
J18 (V
DD
) is a regulated output voltage. Do not connect a 2.5 V supply to this pin.
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 k
Ω
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
and
. The possible SMBus address settings are shown in
. For more information about
SigCon Architect, reference the "SigCon Architect: Installation and Starter's Guide" (
Figure 3. DS1xxDF111EVM Slave Mode Full Setup
Figure 4. DS1xxDF111EVM Slave Mode Close-Up
