SPRUJD3A July 2025 – October 2025 F28E120SB , F28E120SC
Table 14-6 lists the memory-mapped registers for the PGA_REGS registers. All register offset addresses not listed in Table 14-6 should be considered as reserved locations and the register contents should not be modified.
| Offset | Acronym | Register Name | Write Protection |
|---|---|---|---|
| 0h | PGACTL | PGA Control Register | EALLOW,LOCK: PGALOCK_TYPE2.PGACTL |
| 1h | MUXSEL | Mux Selection Register | EALLOW,LOCK: PGALOCK_TYPE2.MUXSEL |
| 2h | OFFSETTRIM | Offset Trim Register | EALLOW,LOCK: PGALOCK_TYPE2.OFFSETTRIM |
| 5h | PGATYPE | PGA Type Register | |
| 6h | PGALOCK | PGA Lock Register | EALLOW |
Complex bit access types are encoded to fit into small table cells. Table 14-7 shows the codes that are used for access types in this section.
| Access Type | Code | Description |
|---|---|---|
| Read Type | ||
| R | R | Read |
| Write Type | ||
| W | W | Write |
| WSonce | W Sonce | Write Set once |
| Reset or Default Value | ||
| -n | Value after reset or the default value | |
| Register Array Variables | ||
| i,j,k,l,m,n | When these variables are used in a register name, an offset, or an address, they refer to the value of a register array where the register is part of a group of repeating registers. The register groups form a hierarchical structure and the array is represented with a formula. | |
| y | When this variable is used in a register name, an offset, or an address it refers to the value of a register array. | |
PGACTL is shown in Figure 14-16 and described in Table 14-8.
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PGA Control Register
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
| CHOP_EXTCTRL | RESERVED | PGA_OUTEN_INTGAIN | PGA_OUTENABLE | ||||
| R/W-0h | R-0h | R/W-0h | R/W-0h | ||||
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| GAIN | RESERVED | FILT_RES_SEL | PGAEN | ||||
| R/W-0h | R-0h | R/W-0h | R/W-0h | ||||
| Bit | Field | Type | Reset | Description |
|---|---|---|---|---|
| 15 | CHOP_EXTCTRL | R/W | 0h | CHOP Signal Control 0 Chop signal is low 1 Chop signal is high Reset type: SYSRSn |
| 14-10 | RESERVED | R | 0h | Reserved |
| 9 | PGA_OUTEN_INTGAIN | R/W | 0h | PGA Internal Gain on Pin 0 PGA internal gain path comes to a pin 1 PGA nternal gain path does not come to a pin Reset type: SYSRSn |
| 8 | PGA_OUTENABLE | R/W | 0h | PGA Output Enable 0 PGA Output does not come to a pin 1 PGA Output does come to a pin Reset type: SYSRSn |
| 7-5 | GAIN | R/W | 0h | PGA Gain programming-1-64 000 x 1 001 x 2/-1 010 x 4/-3 011 x 8/-7 100 x 16/-15 101 x 32/-31 110 x 64/-63 111 reserved Reset type: SYSRSn |
| 4 | RESERVED | R | 0h | Reserved |
| 3-1 | FILT_RES_SEL | R/W | 0h | Filter Resistor Select 000 Filter Disabled 001 50 010 100 011 200 100 400 101 800 110 Filter Disabled 111 Filter Disabled Reset type: SYSRSn |
| 0 | PGAEN | R/W | 0h | PGA Enable. 0 PGA is disabled and powered down. 1 PGA is enabled. Reset type: SYSRSn |
MUXSEL is shown in Figure 14-17 and described in Table 14-9.
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Mux Selection Register
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
| RESERVED | PGA_CHOP | PGA_FBONPIN | RESERVED | MMUXSEL | |||
| R-0h | R/W-0h | R/W-0h | R-0h | R/W-0h | |||
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| RESERVED | NMUXSEL | RESERVED | PMUXSEL | ||||
| R-0h | R/W-0h | R-0h | R/W-0h | ||||
| Bit | Field | Type | Reset | Description |
|---|---|---|---|---|
| 15 | RESERVED | R | 0h | Reserved |
| 14-13 | PGA_CHOP | R/W | 0h | PGA Output Chopping Control 00 Chopping Disabled 01 Reserved 10 ADC assisted chop (using ADCSOC as ctrl) 11 ADC assisted chop (using PGA_CHOP_EXTCTRL register0 Reset type: SYSRSn |
| 12 | PGA_FBONPIN | R/W | 0h | PGA Feedback to Negative Input Connection 0 PGA_INM0 and Inverting Input are not connected 1 PGA_INM0 and Inverting Input are connected Reset type: SYSRSn |
| 11 | RESERVED | R | 0h | Reserved |
| 10-8 | MMUXSEL | R/W | 0h | PGA M Mux Select 0x0 Stand alone op-amp or G=1 mode select 0x1 Non-Inverting gain mode select, feeback resistors have path to VSSA 0x2 Inverting gain mode select, feedback resistors have path to Iocal PGA_INM1 pin 0x3 Inverting gain mode select, feedback resistors have path to Iocal PGA_INM2 pin 0x4 Reserved 0x5 Reserved 0x6 Reserved 0x7 Reserved Reset type: SYSRSn |
| 7 | RESERVED | R | 0h | Reserved |
| 6-4 | NMUXSEL | R/W | 0h | PGA Negative Input Mux Select 0x0 Select RTOP (Inter Gain Resistor Tap Point) as inverting input 0x1 Select RTAP (Pre Gain Resistor Tap Point) as inverting input 0x2 Select PGA_INM1 pin as inverting input 0x3 Select PGA_INM2 pin as inverting input 0x4 Reserved 0x5 Reserved 0x6 Reserved 0x7 Reserved Reset type: SYSRSn |
| 3-2 | RESERVED | R | 0h | Reserved |
| 1-0 | PMUXSEL | R/W | 0h | PGA Positive Input Mux Select 0x0 Select PGA_INP1 pin as non inverting input 0x1 Select PGA_INP2 pin as non inverting input 0x2 Select PGA_INP3 pin as non inverting input 0x3 Reserved Reset type: SYSRSn |
OFFSETTRIM is shown in Figure 14-18 and described in Table 14-10.
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Offset Trim Register
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 |
| RESERVED | PGA_OFFSETTRIMP | ||||||||||||||
| R-0h | R/W-0h | ||||||||||||||
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| RESERVED | PGA_OFFSETTRIMN | ||||||||||||||
| R-0h | R/W-0h | ||||||||||||||
| Bit | Field | Type | Reset | Description |
|---|---|---|---|---|
| 31-24 | RESERVED | R | 0h | Reserved |
| 23-16 | PGA_OFFSETTRIMP | R/W | 0h | PGA internal (analog) offset trim feature for i/p PMOS pair Reset type: SYSRSn |
| 15-8 | RESERVED | R | 0h | Reserved |
| 7-0 | PGA_OFFSETTRIMN | R/W | 0h | PGA internal (analog) offset trim feature for i/p NMOS pair Reset type: SYSRSn |
PGATYPE is shown in Figure 14-19 and described in Table 14-11.
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PGA Type Register
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
| TYPE | |||||||
| R-2h | |||||||
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| REV | |||||||
| R-1h | |||||||
| Bit | Field | Type | Reset | Description |
|---|---|---|---|---|
| 15-8 | TYPE | R | 2h | PGA Type. Reset type: SYSRSn |
| 7-0 | REV | R | 1h | PGA Revision. Reset type: SYSRSn |
PGALOCK is shown in Figure 14-20 and described in Table 14-12.
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PGA Lock Register
| 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 |
| RESERVED | |||||||
| R-0h | |||||||
| 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| RESERVED | RESERVED | RESERVED | RESERVED | PGATMCTL | OFFSETTRIM | MUXSEL | PGACTL |
| WSonce-0h | R-0h | R-0h | R-0h | WSonce-0h | WSonce-0h | WSonce-0h | WSonce-0h |
| Bit | Field | Type | Reset | Description |
|---|---|---|---|---|
| 15-8 | RESERVED | R | 0h | Reserved |
| 7 | RESERVED | WSonce | 0h | Reserved |
| 6 | RESERVED | R | 0h | Reserved |
| 5 | RESERVED | R | 0h | Reserved |
| 4 | RESERVED | R | 0h | Reserved |
| 3 | PGATMCTL | WSonce | 0h | 0 Writes to PGATMCTL are enabled. 1 Writes to PGATMCTL are disabled. Reset type: SYSRSn |
| 2 | OFFSETTRIM | WSonce | 0h | 0 Writes to OFFSETTRIM are enabled. 1 Writes to OFFSETTRIM are disabled. Reset type: SYSRSn |
| 1 | MUXSEL | WSonce | 0h | 0 Writes to MUXSEL are enabled. 1 Writes to MUXSEL are disabled. Reset type: SYSRSn |
| 0 | PGACTL | WSonce | 0h | 0 Writes to PGACTL are enabled. 1 Writes to PGACTL are disabled. Reset type: SYSRSn |