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add more explaination about the DS4432+TPS40305 regulate voltage

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Georges Palauqui 2024-06-11 10:12:35 +02:00
parent 87b4c1c72f
commit d21b26e1e8
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2 changed files with 7 additions and 2 deletions
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2
main/DS4432U.h
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@ -4,6 +4,8 @@
#include <stdbool.h>
#include "esp_check.h"
#define DS4432_VRFS 0.997
bool DS4432U_test(void);
esp_err_t DS4432U_set_current_code(uint8_t output, uint8_t code);
esp_err_t DS4432U_get_current_code(uint8_t output, uint8_t *code);

7
main/vcore.c
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@ -6,8 +6,11 @@
#include "adc.h"
#include "DS4432U.h"
#define TPS40305_VFB 0.6
// DS4432U Transfer function constants for Bitaxe board
#define BITAXE_VFB 0.6
// #define BITAXE_RFS 80000.0 // R16
// #define BITAXE_IFS ((DS4432_VRFS * 127.0) / (BITAXE_RFS * 16))
#define BITAXE_IFS 0.000098921 // (Vrfs / Rfs) x (127/16) -> Vrfs = 0.997, Rfs = 80000
#define BITAXE_RA 4750.0 // R14
#define BITAXE_RB 3320.0 // R15
@ -37,7 +40,7 @@ static uint8_t ds4432_tps40305_bitaxe_voltage_to_reg(float vout)
}
// this is the transfer function. comes from the DS4432U+ datasheet
change = fabs((((BITAXE_VFB / BITAXE_RB) - ((vout - BITAXE_VFB) / BITAXE_RA)) / BITAXE_IFS) * 127);
change = fabs((((TPS40305_VFB / BITAXE_RB) - ((vout - TPS40305_VFB) / BITAXE_RA)) / BITAXE_IFS) * 127);
reg = (uint8_t)ceil(change);
// Set the MSB high if the requested voltage is BELOW nominal