Datasheet

www.ti.com
SWITCHED-MODE STEP-DOWN CONVERTERS — I
2
C REGISTERS
TPS65810
TPS65811
SLVS658B – MARCH 2006 – REVISED FEBRUARY 2007
The I
2
C registers that control buck converter-related functions are shown below. The HEX address for each
register is shown by the register name, together with the R or W functionality for the register bits. Shaded values
indicate default initial power-up values.
B7 B6 B5 B4 B3 B2 B1 B0
SM1_SET1, ADDRESS=10, ALL BITS R/W
Bit name SM1 EN PFM_RPL1 PFM_SM1 SetV4_SM1 SetV3_SM1 SetV2_SM1 SetV1_SM1 SetV0_SM1
Function SM1 ON/OFF SM1 PFM SM1 PFM SM1 OUTPUT VOLTAGE REGULATION VALUE, STANDBY MODE NOT SET
CONTROL FUNCTION MODE ON/OFF
OPERATION CTRL
When 0 OFF MAXIMIZE PWM/PFM See Table 9 for SM1, SM2 voltage setting, Power up default=1.24 V
EFFICIENCY
When 1 ON MINIMIZE Only PWM
OUTPUT
RIPPLE
SM1_SET2, ADDRESS=11, ALL BITS R/W
Bit name NOT USED STANDBY_SM DISCHSM1 S1S2PHASE_1 S1S2PHASE_0 SLEWSM1_2 SLEWSM1_1 SLEWSM1_0
1
Function NOT USED SM1 STANDBY SM1 output SM2 PWM CLOCK DELAY, SM1 OUTPUT SLEW RATE SETTING
MODE ON discharge WITH RESPECT TO SM1 PWM
switch enable CLOCK
When 0 NOT USED OFF OFF 00 = 0 ° 10 = 180 ° 000 = 0.24 010 = 0.96 100 = 5.84 110 = 15.36
01 = 90 ° 11 = 270 ° 001 = 0.48 011 = 1.92 101 = 7.68 111 =
When 1 NOT USED ON ON
Default = 180 ° IMMEDIATE
Unit: mV/ µ s Default= 15.36
SM1_STANDBY, ADDRESS=12, B4-B0 R/W, B7-B5 READ ONLY
Bit name GPIO3LVL GPIO2LVL GPIO1LVL SetV4_SM1SL SetV3_SM1SL SetV2_SM1SL SetV1_SM1SL SetV0_SM1SL
Function GPIO3 pin logic GPIO2 pin logic GPIO1 pin logic SM1 OUTPUT VOLTAGE REGULATION VALUE, STANDBY MODE SET
level level level
When 0 LO LO LO See Table 9 for SM1, SM2 voltage setting, Power-up default = 1.24 V
When 1 HI HI HI
SM2_SET1, ADDRESS=13, ALL REGISTER BITS R/W
Bit name SM2 EN PFM_RPL2 PFM_SM2 SetV4_SM2 SetV3_SM2 SetV2_SM2 SetV1_SM2 SetV0_SM2
Function SM2 ON/OFF SM2 PFM SM2 PFM SM2 OUTPUT VOLTAGE REGULATION VALUE, STANDBY MODE NOT SET
CONTROL FUNCTION MODE ON/OFF
OPERATION CTRL
When 0 OFF MAXIMIZE PWM/PFM See Table 9 for SM1, SM2 voltage setting, Power-up default = 3.32 V
EFFICIENCY
When 1 ON MINIMIZE ONLY PWM
OUTPUT
RIPPLE
SM2_SET2, ADDRESS=14, ALL REGISTER BITS R/W
Bit name NOT USED STANDBY_SM DISCHSM2 NOT USED NOT USED SLEWSM2_2 SLEWSM2_1 SLEWSM2_0
2
Function NOT USED SM2 STANDBY SM2 output NOT USED NOT USED SM2 OUTPUT SLEW RATE SETTING
MODE ON discharge
switch enable
When 0 NOT USED OFF OFF NOT USED NOT USED 000 = 0.48 010 = 1.92 100 = 7.68
110 = 30.72 001 = 0.096 011 = 3.84
When 1 NOT USED ON ON NOT USED NOT USED
101 = 15.36 111 = IMMEDIATE
Unit: mV/ µ s Default = 30.72
SM2_STANDBY, ADDRESS=15, ALL REGISTER BITS R/W
Bit name NOT USED NOT USED NOT USED SetV4_SM2SL SetV3_SM2SL SetV2_SM2SL SetV1_SM2SL SetV0_SM2SL
Function NOT USED NOT USED NOT USED SM1 OUTPUT VOLTAGE REGULATION VALUE, STANDBY MODE SET
When 0 NOT USED NOT USED NOT USED See Table 9 for SM1, SM2 voltage setting, Power up default=3.32 V
When 1 NOT USED NOT USED NOT USED
Copyright © 2006 – 2007, Texas Instruments Incorporated Submit Documentation Feedback 65
Product Folder Link(s): TPS65810 TPS65811